匹配以特定模式开头并以特定模式结束的字符串

Question

I have to fetch all string that starts with [[{ and ends with }]]. I tried to use:

'/^\[\[\{*$\}\}\]\]/'

but it does not work.

Basically I have to fetch some JSON string embedded inside HTML documents.

Answer 1

This is the perfect use for lookarounds and you can use them like so:

$re = '/(?=\[\[\{).*?(?<=\}\]\])/m'; 
preg_match_all($re, $str, $matches);

Here, preg_match_all() searches $str for all matches to the regular expression given in $re and puts them in $matches.

Regex101 Demo