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Asked: 2026-06-09T21:17:02+00:00

Possible Duplicate: Is there a php library for email address validation? How to validate

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Possible Duplicate:
Is there a php library for email address validation?
How to validate an email in php5?

I am aware that there have been plenty of questions regarding email address regular expressions. My question has a specific requirement that I have been unable to find the answer to.

I need a regex that matches email addressas and allows for address tags, such as “testing+tags@gmail.com”. Most regexes I have found fail on email addresses that contain a tag.

NOTE please do not point me to this link. I am looking for something practical, not perfect

EDIT I am aware of the existence of built-in validation in most web app frameworks. RoR, PHP, Django, etc all have it built in. Sometimes, though, for whatever reason, there is a special need. Maybe the user can’t use validation. maybe they are writing their app in some obscure language that doesn’t have built-in validation functions, or has them, but they are out of date. In that case, a regular expression is still useful

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1 Answer

  1. Editorial Team

    My personal favorite has always been this:

    /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i

    Another popular one is also

    /\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b/

    If you are doing this in PHP and if feasible for your problem, I would suggest using filter_var as otherwise suggested. This is merely a suggestion should you need a regular expression that is practical and understood to be imperfect.

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