Validating an email address with regular expressions

Posted by / 20-Aug-2017 09:04

” That’s like saying that opening and closing your fridge really quickly conserves energy and helps fight climate change.

Sure, it helps, if we want to be slaves to the word ‘help’.

There can be 1..n domain labels separated with a period.

The first label (without the period) is defined by This ugly regexp is actually quite similar to the one declared earlier.

Because even the regex behind filter_var has its limitations, a lot of people are of the opinion that you should validate via a link that is sent out to the user’s email.

Example: Of course, not everyone likes the thought of this, simply because many hosting solutions are pretty skimpy when it comes to how many emails you can send per hour / day.

Characters "$", "*", " " "^", "{" and "|" all have their special meanings in regular expressions so they must be escaped with a backslash.

Author: Markus Sipilä Version: 1.0, 2006-08-02 Permanent URL: address validation is quite a bit more complex than it might sound at first.

This PHP script uses regular expressions to check if given input is a syntactically valid email address.

The fact that RFC 2822 allows broader set of characters in email addresses than typically used makes things quite challenging usability wise.

It is a very good and user-friendly idea to check the input for typos (eg. It's syntactically valid but in the real world it would probably be a typo.

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Enter some address here: The domain part of the address is much easier to handle.

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