- var_dump: documentation ( source)
- preg_match: documentation ( source)
<?php
var_dump(preg_match('#/emailAddress=([\w\d\-\.]+@[\w\d\-\.]+\.[\w\d]+)(/|$)#', 'imprec@gmail.com'));
var_dump(preg_match('#/emailAddress=([\w\d\-\.]+@[\w\d\-\.]+\.[\w\d]+)(/|$)#', 'imprec+test@gmail.com'));