PHP valid email format checker function

I have been using this function for years to check email address format validity:

function is_email_valid($var){
	if (eregi("^[a-z0-9]+([-_\.]?[a-z0-9])+@[a-z0-9]+([-_\.]?[a-z0-9])+\.[a-z]{2,4}", $var)) {
		return TRUE;
	} else {
		return FALSE;
	}
}

PHP:

But it seems that at some point since then, TLDs with just one character (for example, q.com) have started being used, and email addresses at these are being deduced to be invalid by this function. Can anyone modify the above code so an address like would pass?

 

see this class its check if the email domian is exsist
EAValidator
How to Work?

* check length of email address max is 320 characters where:
64 characters max for the user of email address 1 character max for the @ 255 characters max for the host name
* apply regular expressions to valid email addres string
* check if exist host to send messages to email address

 

Hi

Try this function:

<?php
	function isValidEmail($email){
		if (preg_match("/^[-a-z0-9~!$%^&*_=+}{\'?]+(\.[-a-z0-9~!$%^&*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.([a-z][a-z]+)|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$/i", $email)) {
			return true;
		}
		return false;
	}

	if(isValidEmail('name@x.com')) {
		echo "Email address is VALID.";
	} else {
		echo "Email address is INVALID";
	}
?>

PHP:

Regards,

Steve

 

Thanks Steve, that works fine .

 

Better still forget the massive regular expressions etc and just use the built in filter_var function with the FILTER_VALIDATE_EMAIL type

if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
  // EMAIL OK
}else{
  // EMAIL INVALID
}

PHP:

Thats far easier and is guaranteed to be correct every time