- var_dump: documentation ( source)
- preg_match: documentation ( source)
<?php
var_dump(preg_match('{\bFirePHP/\d+\.\d+\b}', 'FirePHP/12345678901234567890123456789012345678901234567891234567890123456789.12345678901234567890123456789012345678901234567891234567890123456789a'));