Yet another PHP email validator

function IsValidEmail ($address) {

	return (preg_match(
		'/^[-!#$%&\'*+\\.\/0-9=?A-Z^_`{|}~]+'.   // the user name
		'@'.                                     // at-sign
		'([-0-9A-Z]+\.)+' .                      // host, sub, and domain names
		'([0-9A-Z]){2,4}$/i',                    // top-level domain
		trim($address)));
}

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