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<?php
$input = 'sdfsdf sdfsdf fd<%MYSTRING123%>d12df fsdsgsg d';
preg_match_all('/\[<%MYSTRING\](.*?)\[%>\]/', $input, $matches);
var_dump($matches);

Success #stdin #stdout 0.01s 82944KB

stdin

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Standard input is empty

stdout

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array(2) {
  [0]=>
  array(0) {
  }
  [1]=>
  array(0) {
  }
}

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language:

PHP (php 7.3.5)

created:

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