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<?
function Valida_correo($email)
{
if(!preg_match("/[a-z0-9_-]+(\.[a-z0-9_-]+)*@([0-9a-z][0-9a-z-]*[0-9a-z]\.)+([a-z]{2,4})/i",$email))
return FALSE;
else
return TRUE;
}
$email='[email protected]';
$valido=Valida_correo($email);
if($valido) echo 'direccion de correo valida';
else echo 'direccion no valida';
?>