Validaciones con regexp

gistfile1.php

<?php

function verificar_email($email) { if(preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/",$email)) { return true; } return false; } 

function verificar_password_strenght($password) { if (preg_match("/^.*(?=.{8,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).*$/", $password)) echo "Su password es seguro."; else echo "Su password no es seguro."; } - 

function verificar_ip($ip) { return preg_match("/^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])" . "(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$/", $ip ); } 


?>