- preg_match: documentation ( source)
- print_r: documentation ( source)
<?php
$hit = [];
$str = '/answer 56 this is my sample text';
preg_match('/^\/answer ([1-9][0-9]*) (.{1,512})$/', $str, $hit, PREG_OFFSET_CAPTURE);
echo'<pre>',print_r($hit),'</pre>'; // TODO