PHP regular expression for text with json data

Question

I'm looking for a PHP regular expression to match a pattern for multiple set of json data in a text string.

Paragraph One text

[[{"fid":"28","view_mode":"teaser","fields":{},"type":"media","attributes":{"class":"media-element file-teaser"},"link_text":null}]]

Second Paragraph

[[{"fid":"26","view_mode":"preview","fields":{},"type":"media","attributes":{"class":"file media-element file-preview"},"link_text":"mohan sample.mp4"}]]

Above is the example text with json samples, i want to extract the value of "fid" from each json data.

Any suggestions?

Wouldn't it be easier to json_decode() this and read the value directly? — user1864610
– user1864610, Commented Jan 23, 2015 at 6:54
@anubhava json_decode() won't work if it's mixed in with other text. He needs the regexp to find just the single JSON object so he can decode it. — Barmar
– Barmar, Commented Jan 23, 2015 at 6:56
Do you need to be able to match ANY JSON, or just something very similar to what you've posted? I suspect there's no easy regexp to match JSON in general, because of the recursion and escaping. — Barmar
– Barmar, Commented Jan 23, 2015 at 6:58

vks · Accepted Answer · 2015-01-23 06:57:19Z

1

\[\[{(?:(?!\]\])[\s\S])*"fid":"\K\d+

You can try this.See demo.

https://www.regex101.com/r/rG7gX4/10

$re = "/\\[\\[{(?:(?!\\]\\])[\\s\\S])*\"fid\":\"\\K\\d+/mi";
$str = "[[{\"fid\":\"28\",\"view_mode\":\"teaser\",\"fields\":{},\"type\":\"media\",\"attributes\":{\"class\":\"media-element file-teaser\"},\"link_text\":null}]]\n\nSecond Paragraph\n\n[[{\"fid\":\"26\",\"view_mode\":\"preview\",\"fields\":{},\"type\":\"media\",\"attributes\":{\"class\":\"file media-element file-preview\"},\"link_text\":\"mohan sample.mp4\"}]]";

preg_match_all($re, $str, $matches);

answered Jan 23, 2015 at 6:57

vks

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