<?php $agir = $_REQUEST['agir']; if ($agir == 'ok'){ $email = $_POST['email']; if (ereg("^([0-9,a-z,A-Z,.,_,-]+)([@])([0-9,a-z,A-Z,_,-]+)([.])([a-z,A-Z]{2,3})([.][a-z,A-Z]{2,3})?$", $email)) { print "certo\n"; } else { print "errado\n"; } }else{ echo" <form method=POST> <input type=hidden name=agir value=ok> <input type=text name=email> <input type=submit value=OK> </form>"; } ?>