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

Success #stdin #stdout 0.01s 82944KB

stdin

Standard input is empty

stdout

array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(15) "<%MYSTRING123%>"
  }
}

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language:

PHP (php 7.3.5)

created:

visibility:

secret

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