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* Valida un email usando expresiones regulares.
* Devuelve true si es correcto o false en caso contrario
* @param string $str la dirección a validar
* @return boolean
function is_valid_email($str)
$matches = null;
return (1 === preg_match('/^[A-z0-9\\._-]+@[A-z0-9][A-z0-9-]*(\\.[A-z0-9_-]+)*\\.([A-z]{2,6})$/', $str, $matches));
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