Regex not matching regex in PHP

Question

I am currently working at a project involving regex in php. I wanted to know why or how can I get this recursive regular expression to work in PHP:

/\(((?:(?:[^?+*{}()[\]\\|]+|\\.|\[(?:\^?\\.|\^[^\\]|[^\\^])(?:[^\]\\]+|\\.)*\]|\((?:\?[:=!]|\?<[=!]|\?>)?(?1)??\)|\(\?(?:R|[+-]?\d+)\))(?:(?:[?+*]|\{\d+(?:,\d*)?\})[?+]?)?|\|)*)\)/

It should match this text (for example):

{{"test":"([a-f0-9]{32})"},{"test2":"([a-z]{3})"}}

And the given results should be an array with:

[a-f0-9]{32}
[a-z]{3}

EDIT:

$from = '{{"test":"([a-f0-9]{32})"},{"test2":"([a-z]{3})"}}'; 
preg_match_all("/(((?:(?:[^?+*{}()[]\\|]+|\\.|[(?:\^?\\.|\^[^\]|[^\\^])(?:[^]\]+‌|\\.)*]|((?:\?[:=!]|\?<[=!]|\?>)?(?1)??)|(\?(?:R|[+-]?\d+)))(?:(?:[?+*]|\{\d+‌(?:,\d*)?\})[?+]?)?|\|)*))/", $from, $output_array, PREG_OFFSET_CAPTURE); 
var_dump($output_array);

Can you provide test cases that require the use of recursions ? — Cyrbil
– Cyrbil, Commented Nov 23, 2015 at 16:01
Welcome to Stack Overflow! Please edit your question and don't add code/information in the comments. — Rizier123
– Rizier123, Commented Nov 23, 2015 at 16:03

Ben · Accepted Answer · 2015-11-23 16:14:00Z

3

Why this complex?

preg_match ('/\:"\((.*)\)"/', $search, $ matches);

It seems you just want the values between :"( and )"?

The matches are in $matches.

See http://php.net/manual/en/function.preg-match.php

edited Nov 23, 2015 at 16:14

answered Nov 23, 2015 at 16:07

Ben

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9 Comments

Marius Eugen Circiu Over a year ago

Because I wanted to match all regex in string "from", but your answer makes me think at an alternative. I wanted to use it for this: prntscr.com/961c6c

Marius Eugen Circiu Over a year ago

I want to use each regex from left and get each value and then use it in right textarea using $1, $2, etc...

ksimka Over a year ago

@MariusEugenCirciu, seems like you have a valid json, then why do you need regexp? Decode json, change it how you need it, encode.

Ben Over a year ago

I have edited my post and it should work in this way. I added : in regex. Only if your regex in $from contains the sequence :"( or ") it wont work.

Marius Eugen Circiu Over a year ago

@radioheaded, because each json has id's (matching 32 chars from a-f0-9) and i want to replace entire json with json from right and then use regex from left into right side (as i said $1, $2, etc). I want to make it simplier but i don't know how...

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