sed and jq with an unexpected wait
Obtaining and formatting JSON code
Some webpages contain a huge amount of JSON code which is not easily readable, when provided as a single line. This usually is the case when the bare webpage sourcecode is downloaded.
A very powerful tool, which is able to re-arrange the JSON code in a more convenient tree structure is jq. It is defined as a «lightweight and flexible command-line JSON processor», being also able to perform many other operations with the original code, as shown here. In some OSs, it generates a colored output, to better highlight and differentiate the items.
The entire webpage HTML code can not be used as it is: in order to be correctly processed by jq, only the relevant JSON block must be considered.
The sourcecode of this Instagram post, for example, includes JSON. Being Instagram continuously updated, this code may vary: a copy of its current version is available here. The following steps are based on this version.
One of the easiest ways to obtain the sourcecode of an HTML page is:
user@jclient:~$ curl https://www.instagram.com/p/BpDGK9nnY_Z/ 2>/dev/null
/dev/null avoids that the output page code is merged with the progress bar, also printed by curl in stderr (which is file descriptor 2, which is redirected to /dev/null). As an alternative (but it may not work on some curl versions), use option -s.
Note that no output is provided if the (appartently equivalent) address https://instagram.com/p/BpDGK9nnY_Z/ is used.
All the code will be suddenly printed on stdout and only the last lines will be readable. To avoid this, curl output can be processed by a pager like less, or it can be stored in a file (as done for the local copy):
user@jclient:~$ curl https://www.instagram.com/p/BpDGK9nnY_Z/ 2>/dev/null | less
user@jclient:~$ curl -o example.html https://www.instagram.com/p/BpDGK9nnY_Z/ 2>/dev/null
Either way, the page is now available for inspection, to locate the position of its relevant part:
<script type="text/javascript">window._sharedData = {"config":{"csrf_token":"X1HS1aQeZ3HhMx9imiYmixLwOxATfl1I","viewer":null,"viewerId":null},"country_code":"IT","language_code":"en","locale":"en_US","entry_data":{"PostPage":[{"graphql":{"shortcode_media":{"__typename":"GraphImage","id":"1892383410062462937","shortcode":"BpDGK9nnY_Z","dimensions":{"height":1123,"width":1080},"gating_info":null,"media_preview":"ACkq59RmrCL6VGgq2i+lMQqL61Z8sEdKaENOB7GlcdjPlj2mq+KuS81WpiHoKuxiqsVW1GKTGjWjiQpnvWbMMGnCUgYqu7ZqUUyvKar1JIahzVkE8LbTWmrBl96xl61aQ8UAWHbFVnenGq70hjGbNR0tFMD/2Q==","display_url":"https://scontent-mxp1-1.cdninstagram.com/vp/a45f26e3f353054abd1b5327ef3e0e40/5D0C5567/t51.2885-15/fr/e15/p1080x1080/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","display_resources":[{"src":"https://scontent-mxp1-1.cdninstagram.com/vp/2d63156ec7f76874812d3ccbab763303/5D23478F/t51.2885-15/sh0.08/e35/p640x640/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","config_width":640,"config_height":665},{"src":"https://scontent-mxp1-1.cdninstagram.com/vp/c89f49eac819cc9d0eced4a4764a4a37/5D20ED8F/t51.2885-15/sh0.08/e35/p750x750/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","config_width":750,"config_height":779},{"src":"https://scontent-mxp1-1.cdninstagram.com/vp/a45f26e3f353054abd1b5327ef3e0e40/5D0C5567/t51.2885-15/fr/e15/p1080x1080/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","config_width":1080,"config_height":1123}],"accessibility_caption":"No photo description available.","is_video":false,"should_log_client_event":false,"tracking_token":"eyJ2ZXJzaW9uIjo1LCJwYXlsb2FkIjp7ImlzX2FuYWx5dGljc190cmFja2VkIjp0cnVlLCJ1dWlkIjoiOTE1M2FhMmVmZjEyNDFmOTgzYWU4ZDg0ODg1MzczMDIxODkyMzgzNDEwMDYyNDYyOTM3In0sInNpZ25hdHVyZSI6IiJ9","edge_media_to_tagged_user":{"edges":[]},"edge_media_to_caption":{"edges":[{"node":{"text":"This spiral galaxy has a bright, active core, powered by a supermassive black hole. But how do we learn more about the voraciously feeding black hole at its center - and how it affects other galaxies? Our forthcoming James Webb Space Telescope's sharp vision will be able to see into the swirling material inside the galaxy and measure the motions of stars - one way to confirm the black hole's mass. \nCredits: NASA, ESA, and J. DePasquale (STScI)\n#nasa #solarsystem #science #cosmos #blackholes #galaxy #stars #beautiful #pictureoftheday #universe #astronomy"}}]},"caption_is_edited":true,"has_ranked_comments":false,"edge_media_to_comment":{"count":2530,"page_info":{"has_next_page":true,"end_cursor":"QVFBOXJJZlV3TnB2RzdtVUpTcGJqdXhkTmFaSGpRZDdfbW4zMjB4ckF1Q3R4UGpXa1ZOVGFjQTFNeV9ZWUNiWFpZUU5wLUZyLUwyMGtKelJ2OTFmTWRESg=="},"edges":[{"node":{"id":"18024164737022170","text":"@missbliss46 wtf this is copyright sis, NASA is just a bald man living in his mums basement","created_at":1547807150,"did_report_as_spam":false,"owner":{"id":"1782179886","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/1676425ea6335647dd3d50bbc71c8630/5D168181/t51.2885-19/s150x150/50003743_319204828718699_1789569751047995392_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"unexplainablepatric"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"18022896985055751","text":"@unexplainablepatric honestly NASA can\u2019t trick us anymore now what we know the truth. Like the \u201cmoon landing\u201d FAKE \u201ccircle earth\u201d FAKE. The earth is flat \ud83d\ude31","created_at":1547807209,"did_report_as_spam":false,"owner":{"id":"6027663131","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/877a0a4bfc243ec7c65433fdadd3cc78/5D1CF76E/t51.2885-19/s150x150/47582101_218752055695458_4520459555850682368_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"stephanieku_o"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"18004919218123857","text":"@stephaniek2003 flat earth community unite","created_at":1547807251,"did_report_as_spam":false,"owner":{"id":"6027663131","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/877a0a4bfc243ec7c65433fdadd3cc78/5D1CF76E/t51.2885-19/s150x150/47582101_218752055695458_4520459555850682368_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"stephanieku_o"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17999749702081281","text":"@unexplainablepatric there was a typo \"snapchat\"","created_at":1547807290,"did_report_as_spam":false,"owner":{"id":"1782179886","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/1676425ea6335647dd3d50bbc71c8630/5D168181/t51.2885-19/s150x150/50003743_319204828718699_1789569751047995392_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"unexplainablepatric"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17843311564351687","text":"\u0628\u0647 \u067e\u06cc\u062c \u0645\u0646 \u0647\u0645 \u0633\u0631 \u0628\u0632\u0646\u06cc\u062f","created_at":1548026298,"did_report_as_spam":false,"owner":{"id":"7756980698","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/9b74590e612e0b84b05aabb10c289b19/5D176027/t51.2885-19/s150x150/52713151_2372719546112613_8520771475207094272_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"saeid_seifi492492"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17996072890176723","text":"\"voc\u00eas est\u00e3o todos errados, tudo isso \u00e9 um monte de tartaruga uma em cima da outra\"","created_at":1548178733,"did_report_as_spam":false,"owner":{"id":"8538924367","is_verified":false,"profile_pic_url":"https://instagram.ficn1-1.fna.fbcdn.net/vp/ec397c980dd9ea03b36724e86d6e49a2/5D2CF3F1/t51.2885-19/44884218_345707102882519_2446069589734326272_n.jpg?_nc_ht=instagram.ficn1-1.fna.fbcdn.net","username":"danielbar.ros"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"18006011653123953","text":"Milky way","created_at":1548181322,"did_report_as_spam":false,"owner":{"id":"10123715986","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/2b5570066a69f05536734b57b9545f6a/5D2C7657/t51.2885-19/s150x150/49858585_533407277170930_1296288084177977344_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"dead_shadow2167"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"17950144549237174","text":"\u0644\u0627\u06cc\u06a9","created_at":1548211885,"did_report_as_spam":false,"owner":{"id":"7756980698","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/9b74590e612e0b84b05aabb10c289b19/5D176027/t51.2885-19/s150x150/52713151_2372719546112613_8520771475207094272_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"saeid_seifi492492"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"18026052556009892","text":"\u0644\u0627\u06cc\u06a9","created_at":1548279255,"did_report_as_spam":false,"owner":{"id":"7756980698","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/9b74590e612e0b84b05aabb10c289b19/5D176027/t51.2885-19/s150x150/52713151_2372719546112613_8520771475207094272_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"saeid_seifi492492"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17926903819264153","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the white snow that looks at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Mention it. [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548545531,"did_report_as_spam":false,"owner":{"id":"4980586128","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/dffecfd6418e99952cede24f6d8dc944/5D4ECB5C/t51.2885-19/s150x150/51961998_799310527111417_5130666652177793024_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"18026203102019480","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the white snow that looks at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Mention it. [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548545554,"did_report_as_spam":false,"owner":{"id":"4980586128","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/dffecfd6418e99952cede24f6d8dc944/5D4ECB5C/t51.2885-19/s150x150/51961998_799310527111417_5130666652177793024_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"17927019826264514","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the snow from the white snow that stares at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Says [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548550111,"did_report_as_spam":false,"owner":{"id":"7596209711","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/83a47b04de4b8164146f4fa76109ad4f/5D095BC5/t51.2885-19/s150x150/50940489_629853697445686_4490521447659208704_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme.ir"},"viewer_has_liked":false,"edge_liked_by":{"count":2}}},{"node":{"id":"18003217156081075","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the snow from the white snow that stares at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Says [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548550114,"did_report_as_spam":false,"owner":{"id":"7596209711","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/83a47b04de4b8164146f4fa76109ad4f/5D095BC5/t51.2885-19/s150x150/50940489_629853697445686_4490521447659208704_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme.ir"},"viewer_has_liked":false,"edge_liked_by":{"count":2}}},{"node":{"id":"18010774216117895","text":"\u0628\u0627 \u0639\u0631\u0636 \u0645\u0639\u0630\u0631\u062a \u0645\u0646 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0641\u0627\u0631\u0633\u06cc \u062f\u0627\u0631\u0645 \u0648 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u062a\u0648\u0633\u0637 \u0628\u0631\u0646\u0627\u0645\u0647 \u062a\u0631\u062c\u0645\u0647 \u06af\u0631 \u06af\u0648\u06af\u0644 \u062a\u0631\u062c\u0645\u0647 \u0645\u06cc \u06a9\u0646\u0645 \u0648 \u0633\u062e\u0646\u0627\u0646 \u062f\u0631\u0628\u0627\u0631\u0647 \u06a9\u0647\u06a9\u0634\u0627\u0646 \u0647\u0627 \u062f\u0686\u0627\u0631 \u0627\u062e\u062a\u0644\u0627\u0644 \u0645\u06cc \u0634\u0648\u0646\u062f \u0648 \u062f\u0631\u0633\u062a \u0627\u0646\u0686\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u0645 \u062a\u0631\u062c\u0645\u0647 \u0646\u0645\u06cc \u0634\u0648\u062f \u0648 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0645\u0646\u0638\u0648\u0631\u0645 \u0631\u0627 \u0627\u0634\u062a\u0628\u0627\u0647 \u06af\u06cc\u0631\u062f \u062e\u0648\u062f\u062a\u0627 \u0633\u0639\u06cc \u062f\u0642\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0627\u0646\u0686\u0647 \u0645\u0637\u0627\u0628\u0642 \u0628\u0627 \u0639\u0642\u0644 \u0627\u0633\u062a \u062f\u0631\u0633\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f","created_at":1548550976,"did_report_as_spam":false,"owner":{"id":"4980586128","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/dffecfd6418e99952cede24f6d8dc944/5D4ECB5C/t51.2885-19/s150x150/51961998_799310527111417_5130666652177793024_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"17918937475272250","text":"Sorry, I have these words in Farsi and translate these words into English by the Google Translator program, and the words about the galaxies are interrupted, and I just do not translate what I want and may make me wrong. Carefully take care of your words and make them read in accordance with the wisdom\u0628\u0627 \u0639\u0631\u0636 \u0645\u0639\u0630\u0631\u062a \u0645\u0646 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0641\u0627\u0631\u0633\u06cc \u062f\u0627\u0631\u0645 \u0648 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u062a\u0648\u0633\u0637 \u0628\u0631\u0646\u0627\u0645\u0647 \u062a\u0631\u062c\u0645\u0647 \u06af\u0631 \u06af\u0648\u06af\u0644 \u062a\u0631\u062c\u0645\u0647 \u0645\u06cc \u06a9\u0646\u0645 \u0648 \u0633\u062e\u0646\u0627\u0646 \u062f\u0631\u0628\u0627\u0631\u0647 \u06a9\u0647\u06a9\u0634\u0627\u0646 \u0647\u0627 \u062f\u0686\u0627\u0631 \u0627\u062e\u062a\u0644\u0627\u0644 \u0645\u06cc \u0634\u0648\u0646\u062f \u0648 \u062f\u0631\u0633\u062a \u0627\u0646\u0686\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u0645 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The JSON of interest is entirely included inside line 284 of the page sourcecode. Only the part between curly brackets can be used as an input for jq (otherwise an error will be generated): this is the actual JSON block. To extract it from the rest of the page, sed is a suitable tool. It operates line by line: from FreeBSD’s sed(1) manpage,
Normally, sed cyclically copies a line of input, not including its termi-
nating newline character, into a pattern space, (unless there is some-
thing left after a ``D'' function), applies all of the commands with
addresses that select that pattern space, copies the pattern space to the
standard output, appending a newline, and deletes the pattern space.
Also, from Wikibooks,
Sed is line-oriented – it operates one line at a time – and allows regular expression matching and substitution.
In line 284, in particular, sed should detect and print all the characters between
<script type="text/javascript">window._sharedData =
(with a final space) and
;</script>
This can be accomplished through an appropriate use of Regular Expressions:
sed -nEe 's/^.*sharedData = (.*);<\/script>$/\1/p'
Option -n prevents sed from printing all the lines, in addition to the selected (and modified) one. Option -E enables use of more advanced and modern Regular Expressions: basic, default ones would be too limited for this case. Option -e enables the use of the following string as a command:
's/^.*sharedData = (.*);<\/script>$/\1/p'
It performs a substitution, as the pattern s/string1/string2/p' suggests. Consider a line beginning with any occurrence of any character, ^.*, followed by the string sharedData = . This matches, for example,
<script type="text/javascript">window._sharedData =
Consider then, as a separate group of characters, all the following ones (which can be any occurrence of any character, .*), until ;<\/script>$, which should also be the end of the line. Slash character in </script> is escaped through a backslash \, to avoid confusion with the substitution command syntax s/string1/string2/p. $ indicates that the previous characters represent the end of the line.
From now on, the separate group, isolated from the rest of the line through the round brackets (), can be referred to as \1 (being it the first, and only in this example, group).
The whole 's/^.*sharedData = (.*);<\/script>$/\1/p' performs the following substitution: «in the line which matches the structure ^.*sharedData = (.*);<\/script>$, replace this whole structure with the group \1 only, and print the resulting modified line», as stated by the final p.
sed processes each line of the webpage sourcecode individually. In this example, only line 284 will generate a match.
The JSON can be now obtained as:
user@jclient:~$ curl 'https://www.instagram.com/p/BpDGK9nnY_Z/' 2>/dev/null | sed -nEe 's/^.*sharedData = (.*);<\/script>$/\1/p' | less
It is
{"config":{"csrf_token":"DbDbSRdfDKF7wxj5m6UPw09xDIuQKQKQ","viewer":null,"viewerId":null},"country_code":"IT","language_code":"en","locale":"en_US","entry_data":{"PostPage":[{"graphql":{"shortcode_media":{"__typename":"GraphImage","id":"1892383410062462937","shortcode":"BpDGK9nnY_Z","dimensions":{"height":1123,"width":1080},"gating_info":null,"media_preview":"ACkq59RmrCL6VGgq2i+lMQqL61Z8sEdKaENOB7GlcdjPlj2mq+KuS81WpiHoKuxiqsVW1GKTGjWjiQpnvWbMMGnCUgYqu7ZqUUyvKar1JIahzVkE8LbTWmrBl96xl61aQ8UAWHbFVnenGq70hjGbNR0tFMD/2Q==","display_url":"https://scontent-mxp1-1.cdninstagram.com/vp/a45f26e3f353054abd1b5327ef3e0e40/5D0C5567/t51.2885-15/fr/e15/p1080x1080/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","display_resources":[{"src":"https://scontent-mxp1-1.cdninstagram.com/vp/2d63156ec7f76874812d3ccbab763303/5D23478F/t51.2885-15/sh0.08/e35/p640x640/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","config_width":640,"config_height":665},{"src":"https://scontent-mxp1-1.cdninstagram.com/vp/c89f49eac819cc9d0eced4a4764a4a37/5D20ED8F/t51.2885-15/sh0.08/e35/p750x750/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","config_width":750,"config_height":779},{"src":"https://scontent-mxp1-1.cdninstagram.com/vp/a45f26e3f353054abd1b5327ef3e0e40/5D0C5567/t51.2885-15/fr/e15/p1080x1080/43778265_167209230886392_7569456462140543999_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","config_width":1080,"config_height":1123}],"accessibility_caption":"No photo description available.","is_video":false,"should_log_client_event":false,"tracking_token":"eyJ2ZXJzaW9uIjo1LCJwYXlsb2FkIjp7ImlzX2FuYWx5dGljc190cmFja2VkIjp0cnVlLCJ1dWlkIjoiYTM4M2IzYmYxMjVmNGUzZWE1YmU5YTZlMzllMmQ4YWYxODkyMzgzNDEwMDYyNDYyOTM3In0sInNpZ25hdHVyZSI6IiJ9","edge_media_to_tagged_user":{"edges":[]},"edge_media_to_caption":{"edges":[{"node":{"text":"This spiral galaxy has a bright, active core, powered by a supermassive black hole. But how do we learn more about the voraciously feeding black hole at its center - and how it affects other galaxies? Our forthcoming James Webb Space Telescope's sharp vision will be able to see into the swirling material inside the galaxy and measure the motions of stars - one way to confirm the black hole's mass. \nCredits: NASA, ESA, and J. DePasquale (STScI)\n#nasa #solarsystem #science #cosmos #blackholes #galaxy #stars #beautiful #pictureoftheday #universe #astronomy"}}]},"caption_is_edited":true,"has_ranked_comments":false,"edge_media_to_comment":{"count":2530,"page_info":{"has_next_page":true,"end_cursor":"QVFDb0Z0TGVKc3E3R0hUOGNfVC10eXNRdTV1SVV4a1ViQVRYVS1rSzd1QWNjSjJoRnFXdXd1VUF4cmV1eWpQYWFvTTVLX2owd3puQkRMZm81aDVmTEhuNQ=="},"edges":[{"node":{"id":"18024164737022170","text":"@missbliss46 wtf this is copyright sis, NASA is just a bald man living in his mums basement","created_at":1547807150,"did_report_as_spam":false,"owner":{"id":"1782179886","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/1676425ea6335647dd3d50bbc71c8630/5D168181/t51.2885-19/s150x150/50003743_319204828718699_1789569751047995392_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"unexplainablepatric"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"18022896985055751","text":"@unexplainablepatric honestly NASA can\u2019t trick us anymore now what we know the truth. Like the \u201cmoon landing\u201d FAKE \u201ccircle earth\u201d FAKE. The earth is flat \ud83d\ude31","created_at":1547807209,"did_report_as_spam":false,"owner":{"id":"6027663131","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/877a0a4bfc243ec7c65433fdadd3cc78/5D1CF76E/t51.2885-19/s150x150/47582101_218752055695458_4520459555850682368_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"stephanieku_o"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"18004919218123857","text":"@stephaniek2003 flat earth community unite","created_at":1547807251,"did_report_as_spam":false,"owner":{"id":"6027663131","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/877a0a4bfc243ec7c65433fdadd3cc78/5D1CF76E/t51.2885-19/s150x150/47582101_218752055695458_4520459555850682368_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"stephanieku_o"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17999749702081281","text":"@unexplainablepatric there was a typo \"snapchat\"","created_at":1547807290,"did_report_as_spam":false,"owner":{"id":"1782179886","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/1676425ea6335647dd3d50bbc71c8630/5D168181/t51.2885-19/s150x150/50003743_319204828718699_1789569751047995392_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"unexplainablepatric"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17843311564351687","text":"\u0628\u0647 \u067e\u06cc\u062c \u0645\u0646 \u0647\u0645 \u0633\u0631 \u0628\u0632\u0646\u06cc\u062f","created_at":1548026298,"did_report_as_spam":false,"owner":{"id":"7756980698","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/9b74590e612e0b84b05aabb10c289b19/5D176027/t51.2885-19/s150x150/52713151_2372719546112613_8520771475207094272_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"saeid_seifi492492"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17996072890176723","text":"\"voc\u00eas est\u00e3o todos errados, tudo isso \u00e9 um monte de tartaruga uma em cima da outra\"","created_at":1548178733,"did_report_as_spam":false,"owner":{"id":"8538924367","is_verified":false,"profile_pic_url":"https://instagram.fada1-4.fna.fbcdn.net/vp/2d063ac6341e3ecb1d71a60da14ac152/5D2CF3F1/t51.2885-19/44884218_345707102882519_2446069589734326272_n.jpg?_nc_ad=z-m\u0026_nc_ht=instagram.fada1-4.fna.fbcdn.net","username":"danielbar.ros"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"18006011653123953","text":"Milky way","created_at":1548181322,"did_report_as_spam":false,"owner":{"id":"10123715986","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/2b5570066a69f05536734b57b9545f6a/5D2C7657/t51.2885-19/s150x150/49858585_533407277170930_1296288084177977344_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"dead_shadow2167"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"17950144549237174","text":"\u0644\u0627\u06cc\u06a9","created_at":1548211885,"did_report_as_spam":false,"owner":{"id":"7756980698","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/9b74590e612e0b84b05aabb10c289b19/5D176027/t51.2885-19/s150x150/52713151_2372719546112613_8520771475207094272_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"saeid_seifi492492"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"18026052556009892","text":"\u0644\u0627\u06cc\u06a9","created_at":1548279255,"did_report_as_spam":false,"owner":{"id":"7756980698","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/9b74590e612e0b84b05aabb10c289b19/5D176027/t51.2885-19/s150x150/52713151_2372719546112613_8520771475207094272_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"saeid_seifi492492"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17926903819264153","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the white snow that looks at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Mention it. [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548545531,"did_report_as_spam":false,"owner":{"id":"4980586128","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/dffecfd6418e99952cede24f6d8dc944/5D4ECB5C/t51.2885-19/s150x150/51961998_799310527111417_5130666652177793024_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"18026203102019480","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the white snow that looks at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Mention it. [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548545554,"did_report_as_spam":false,"owner":{"id":"4980586128","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/dffecfd6418e99952cede24f6d8dc944/5D4ECB5C/t51.2885-19/s150x150/51961998_799310527111417_5130666652177793024_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"17927019826264514","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the snow from the white snow that stares at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Says [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548550111,"did_report_as_spam":false,"owner":{"id":"7596209711","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/83a47b04de4b8164146f4fa76109ad4f/5D095BC5/t51.2885-19/s150x150/50940489_629853697445686_4490521447659208704_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme.ir"},"viewer_has_liked":false,"edge_liked_by":{"count":2}}},{"node":{"id":"18003217156081075","text":"In a very important statement from the Prophet of the Muslims about the galaxies: \"Allah has created the transcendence of the throne and the seat from his light, and the throne is seated, and the angels are within the seat, and the four corners are around the throne: a lake of light shining, a fire of fire The tabernacle, and the snow from the white snow that stares at the eyes, and the water of the water, and the angels stand in the streams, and praise God in glory, the throne has the language of all the people who speak the language, and glorify God with all of them. Says [4]\nImam Sadeq (as quoted by his fathers) as Imam Ali (as): Holy Prophet Muhammad (peace be upon him), peace be upon him, said: \"In heaven, there are houses that are seen outside them, and inside them out of them.\"\n[4]: in Al-Mansour 3: 297\nI have over 400 500 speakers of the Imams and the Prophet of Islam about the features and wonders of the universe. If you would like to tell me to send you, we will be glad.","created_at":1548550114,"did_report_as_spam":false,"owner":{"id":"7596209711","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/83a47b04de4b8164146f4fa76109ad4f/5D095BC5/t51.2885-19/s150x150/50940489_629853697445686_4490521447659208704_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme.ir"},"viewer_has_liked":false,"edge_liked_by":{"count":2}}},{"node":{"id":"18010774216117895","text":"\u0628\u0627 \u0639\u0631\u0636 \u0645\u0639\u0630\u0631\u062a \u0645\u0646 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0641\u0627\u0631\u0633\u06cc \u062f\u0627\u0631\u0645 \u0648 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u062a\u0648\u0633\u0637 \u0628\u0631\u0646\u0627\u0645\u0647 \u062a\u0631\u062c\u0645\u0647 \u06af\u0631 \u06af\u0648\u06af\u0644 \u062a\u0631\u062c\u0645\u0647 \u0645\u06cc \u06a9\u0646\u0645 \u0648 \u0633\u062e\u0646\u0627\u0646 \u062f\u0631\u0628\u0627\u0631\u0647 \u06a9\u0647\u06a9\u0634\u0627\u0646 \u0647\u0627 \u062f\u0686\u0627\u0631 \u0627\u062e\u062a\u0644\u0627\u0644 \u0645\u06cc \u0634\u0648\u0646\u062f \u0648 \u062f\u0631\u0633\u062a \u0627\u0646\u0686\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u0645 \u062a\u0631\u062c\u0645\u0647 \u0646\u0645\u06cc \u0634\u0648\u062f \u0648 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0645\u0646\u0638\u0648\u0631\u0645 \u0631\u0627 \u0627\u0634\u062a\u0628\u0627\u0647 \u06af\u06cc\u0631\u062f \u062e\u0648\u062f\u062a\u0627 \u0633\u0639\u06cc \u062f\u0642\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0627\u0646\u0686\u0647 \u0645\u0637\u0627\u0628\u0642 \u0628\u0627 \u0639\u0642\u0644 \u0627\u0633\u062a \u062f\u0631\u0633\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f","created_at":1548550976,"did_report_as_spam":false,"owner":{"id":"4980586128","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/dffecfd6418e99952cede24f6d8dc944/5D4ECB5C/t51.2885-19/s150x150/51961998_799310527111417_5130666652177793024_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"17918937475272250","text":"Sorry, I have these words in Farsi and translate these words into English by the Google Translator program, and the words about the galaxies are interrupted, and I just do not translate what I want and may make me wrong. Carefully take care of your words and make them read in accordance with the wisdom\u0628\u0627 \u0639\u0631\u0636 \u0645\u0639\u0630\u0631\u062a \u0645\u0646 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0641\u0627\u0631\u0633\u06cc \u062f\u0627\u0631\u0645 \u0648 \u0627\u06cc\u0646 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u062a\u0648\u0633\u0637 \u0628\u0631\u0646\u0627\u0645\u0647 \u062a\u0631\u062c\u0645\u0647 \u06af\u0631 \u06af\u0648\u06af\u0644 \u062a\u0631\u062c\u0645\u0647 \u0645\u06cc \u06a9\u0646\u0645 \u0648 \u0633\u062e\u0646\u0627\u0646 \u062f\u0631\u0628\u0627\u0631\u0647 \u06a9\u0647\u06a9\u0634\u0627\u0646 \u0647\u0627 \u062f\u0686\u0627\u0631 \u0627\u062e\u062a\u0644\u0627\u0644 \u0645\u06cc \u0634\u0648\u0646\u062f \u0648 \u062f\u0631\u0633\u062a \u0627\u0646\u0686\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u0645 \u062a\u0631\u062c\u0645\u0647 \u0646\u0645\u06cc \u0634\u0648\u062f \u0648 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0645\u0646\u0638\u0648\u0631\u0645 \u0631\u0627 \u0627\u0634\u062a\u0628\u0627\u0647 \u06af\u06cc\u0631\u062f \u062e\u0648\u062f\u062a\u0627 \u0633\u0639\u06cc \u062f\u0642\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0633\u062e\u0646\u0627\u0646 \u0631\u0627 \u0627\u0646\u0686\u0647 \u0645\u0637\u0627\u0628\u0642 \u0628\u0627 \u0639\u0642\u0644 \u0627\u0633\u062a \u062f\u0631\u0633\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f","created_at":1548556545,"did_report_as_spam":false,"owner":{"id":"4980586128","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/dffecfd6418e99952cede24f6d8dc944/5D4ECB5C/t51.2885-19/s150x150/51961998_799310527111417_5130666652177793024_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"yosofefateme"},"viewer_has_liked":false,"edge_liked_by":{"count":1}}},{"node":{"id":"18011935726104687","text":"\u0646\u0638\u0631\u062a\u0648\u0646 \u0631\u0627\u062c\u0628 \u0646\u06cc\u0648\u06cc\u0648\u0631\u0633\u06cc\u062a\u06cc \u06cc\u0627 \u062f\u0628\u06cc \u06cc\u0627 \u062a\u0631\u06a9\u06cc\u0647 \u0686\u06cc\u0647 \u061f \u0627\u06af\u0631 \u0627\u0632 \u062f\u06cc\u062f\u0646 \u0645\u0646\u0627\u0637\u0642 \u0632\u06cc\u0628\u0627\u06cc \u062f\u0646\u06cc\u0627 \u0644\u0630\u062a \u0645\u06cc\u0628\u0631\u06cc\u062f \u0628\u0647 \u067e\u06cc\u062c \u0645\u0646 \u0633\u0631 \u0628\u0632\u0646\u06cc\u062f \ud83c\udf39\u0627\u0631\u0627\u062f\u062a \u0645\u0646\u062f \u0634\u0645\u0627 \u0632\u0627\u0631\u0627","created_at":1548659519,"did_report_as_spam":false,"owner":{"id":"6005250754","is_verified":false,"profile_pic_url":"https://scontent-mxp1-1.cdninstagram.com/vp/99286dcb6bd777e450f8087b9287d615/5D1EB2EB/t51.2885-19/s150x150/37947998_245067519661138_2530257743374188544_n.jpg?_nc_ht=scontent-mxp1-1.cdninstagram.com","username":"world_travel_pixs"},"viewer_has_liked":false,"edge_liked_by":{"count":0}}},{"node":{"id":"17848562290344673","text":"this is lie the earth is 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and it is pretty unreadable, as anticipated. The simplest use of jq, shown in the repository tutorial, is already an improvement for the code appearance:
user@jclient:~$ curl 'https://www.instagram.com/p/BpDGK9nnY_Z/' 2>/dev/null | sed -nEe 's/^.*sharedData = (.*);<\/script>$/\1/p' | jq '.'
{
"config": {
"csrf_token": "2hLsxxkHTvHtVKFtnnY7Wz3v1BfIy0dO",
"viewer": null,
"viewerId": null
},
"country_code": "IT",
"language_code": "en",
"locale": "en_US",
"entry_data": {
"PostPage": [
{
"graphql": {
"shortcode_media": {
"__typename": "GraphImage",
"id": "1892383410062462937",
"shortcode": "BpDGK9nnY_Z",
"dimensions": {
"height": 1123,
"width": 1080
},
...
This output can be redirected to a file, or to less through a pipe, to further inspection.
The timings
The JSON block in line 284 is huge, with a length of 29491 characters. The same block, formatted with jq, includes a big amount of newline characters and its length grows to 43293 characters. With current multi-core, high frequency CPUs this could be negligible, but it is not a general rule.
With an Intel® Core™ i5-4670 CPU at 3.40 GHz running Ubuntu 18.04, the formatted JSON is obtained with no detectable delay (with the one-liner used above, with Ubuntu sed and jq).
With this CPU equipment
user@jclient:~$ sysctl hw.model hw.machine hw.ncpu
hw.model: Intel(R) Core(TM)2 Duo CPU T5870 @ 2.00GHz
hw.machine: amd64
hw.ncpu: 2
running FreeBSD 12.0-RELEASE, the length of such a string makes the difference instead.
Note: it has not been possible to perform the most logical test, that is using the same OS for both the processors. Consequently, the bottleneck may, or may not, be also represented by the OS and its available versions of sed and jq.
If the one-liner
user@jclient:~$ curl 'https://www.instagram.com/p/BpDGK9nnY_Z/' 2>/dev/null | sed -nEe 's/^.*sharedData = (.*);<\/script>$/\1/p' | jq '.'
is run on the second and slower machine, with Intel® Core™ 2 Duo CPU T5870 at 2.00 GHz, prompt seems to never return. If the string were not found (for example, due to some difference on the Regular Expressions syntax required by FreeBSD’s implementation of sed), prompt would return with an error and no match. In this case instead, it seems to wait, or to endlessly search for a path matching in some line.
There is no syntax error in the Regular Expression. A shorter line, with the same beginning and the same end of the JSON block, is correctly processed.
The unexpected behaviour may then be the consequence of a maximum line length allowed by FreeBSD’s sed implementation. From GNU documentation:
Some implementations have been known to limit line lengths (for the pattern and hold spaces) to be no more than 4000 bytes. The POSIX standard specifies that conforming sed implementations shall support at least 8192 byte line lengths. GNU sed has no built-in limit on line length; as long as it can malloc() more (virtual) memory, you can feed or construct lines as long as you like. However, recursion is used to handle subpatterns and indefinite repetition. This means that the available stack space may limit the size of the buffer that can be processed by certain patterns.
In STANDARDS section, FreeBSD’s sed(1) states that:
The sed utility is expected to be a superset of the IEEE Std 1003.2
(``POSIX.2'') specification.
which only grants that a string length of 8192 bytes is supported. It is still not enough for the JSON block.
If a test string with length sligthly greater than 8192 is provided to sed, it performs as expected, but after some amount of human-measurable time. With longer test strings, the amount of time increases. If the original JSON string is provided, after several dozens of seconds, this is the output of top:
last pid: 46328; load averages: 0.94, 0.51, 0.31 up 4+02:30:40 16:00:33
58 processes: 2 running, 56 sleeping
CPU: 51.8% user, 0.0% nice, 0.6% system, 0.0% interrupt, 47.6% idle
Mem: 1622M Active, 182M Inact, 172M Laundry, 620M Wired, 214M Buf, 352M Free
Swap: 6144M Total, 2771M Used, 3373M Free, 45% Inuse, 24K In
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
41707 user 1 102 0 11M 2608K CPU0 0 0:53 99.55% sed
sed is still using almost entirely a processor. It was not stuck and, after a long wait, the expected formatted JSON block is eventually provided. Performing several tests with the JSON string from the Instagram webpage, the required time varied from 1m57s to 2m15s.
This old and slow system is therefore able to produce the expected result as well, but only after a long wait, due to the unusual length of the string.