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I always find regular expressions a headache, and googling didn't really help. I'm currently using the following expression (preg_match): /^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/
However, if I'd want to allow emails with plus symbols, this obviously won't work, eg: [email protected]
How would I need to change my expression to allow it? Thanks in advance for all the help!
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Regex provides the ability to validate the structure of an email address. It can be handled with one or two lines of code and can easily be tweaked to handle a wide variation of different parameters. However, one thing to keep in mind is that it can only check the structure of an email address.
[a-zA-Z0-9+_. -] matches one character from the English alphabet (both cases), digits, “+”, “_”, “.” and, “-” before the @ symbol. + indicates the repetition of the above-mentioned set of characters one or more times. @ matches itself.
The best all-around regex to find valid email addressesallows Latin characters ("a" - "z" or "A" - "Z") within the email address. permits digits (0 - 9) in the email address. enforces domain part restrictions. allows hyphens (-) inside the domain as long as they don't lead or trail the domain.
You should just use PHPs builtin regex for email validation, because it covers all the things:
filter_var($email, FILTER_VALIDATE_EMAIL)
See filter_var and FILTER_VALIDATE_EMAIL (or https://github.com/php/php-src/blob/master/ext/filter/logical_filters.c#L499 for the actual beast).
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