Regex problem Email test

i have some problem with pattern bellow:

/([A-Z0-9]+[A-Z0-9._+-]*){3,64}@(([A-Z0-9]+([-][A-Z0-9])*){2,}.)+([A-Z0-9]+([-][A-Z0-9])*){2,}/i

It match email addresses and i have problem with this rule:

[A-Z0-9._+-]*

If i remove the star it works but i want this characters to be 0 or more. I tested it on http://regexpal.com/ and it works but on preg_match_all (PHP) - didn't work

Thanks

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First of all, there are plenty of resources for this available. A quick search for "email validation regex" yields tons of results... Including This One...

Secondly, the problem is not in the * character. The problem is in the whole block.

([A-Z0-9]+[A-Z0-9._+-]*){3,64}

Look at what that's doing. It's basically saying match as many alpha-numerics as possible, then match as many alpha-numerics with other characters as possible, then repeat at least 3 and at most 64 times. That could be a LOT of characters...

Instead, you could do:

([A-Z0-9][A-Z0-9._+-]{2,63})

Which will at most result in a match against a 64 character email.

Oh, and this is the pain of parsing emails with regex

There are plenty of other resources for validating email addresses (Including filter_var ). Do some searching and see how the popular frameworks do it...

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Why not use PHPs filter_var()

filter_var('test@email.com', FILTER_VALIDATE_EMAIL)

There is no good regex to validate email addresses. If you absolutely MUST use regex, then maybe have a look at Validate an E-Mail Address with PHP, the Right Way. Although, this is by no means a perfect measure either.

Edit: After some digging, I came across Mailparse.

Mailparse is an extension for parsing and working with email messages. It can deal with » RFC 822 and » RFC 2045 (MIME) compliant messages.

Mailparse is stream based, which means that it does not keep in-memory copies of the files it processes - so it is very resource efficient when dealing with large messages.

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Try this regex :

/^[A-Z0-9][A-Z0-9._+-]{3,64}@([A-Z0-9][-A-Z0-9]*.)+[A-Z0-9]{2,}$/i

But like @Russell Dias said, you shouldn't use regex for emails.

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