Regular Expressions (RegEx) Tutorial #15 – Email RegEx Pattern

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Hey gang, in this RegEx tutorial we’ll have a look at how to create an email regex pattern, to validate our user input in the email field. DONATE …

Tag: email regex java, [vid_tags]

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  1. ^([+a-zA-Zd._-]+)@([a-zA-Zd]+).([a-zA-z]{2,8})(.[a-zA-z]{2,8})?$

    Regex version with capital letters (since everyone converts to lowercase but caps are allowed) and plus(+) before @ and also underscore(_) is allowed before @

  2. Not that this is a Dart/Flutter course, but there's a package in the pub called email_validator which precisely follows the specifications. There's a similar package for Perl called Mail::RFC822::Address that does the right thing again according to the standards. That module creates a regex up from smaller pieces, and for grins got expanded as . Yes, that page of text is the SMALLEST VALID REGEX for a legal email. If your handmade regex is any shorter than that, you will get false negatives. Specifically, the regex here fails on one of my addresses: fred&, and on one of my friend's addresses: * Yes, a solitary asterisk is a valid email localpart.

  3. Thanks, for your playlist. But this RegEx wouldn't recognise my student e-mail: . But this seams to be a speziell think because by some websites this e-mail causes problems.

  4. Before first lecture : WTF! is this – /^([a-zd.-]+)@([a-zd-]+).([a-z]{2,8})(.[a-z]{2,8})?$/
    After last lecture : Oh! this is so easy to understand.
    Thanks Net Ninja for this wonderful playlist on Regular Expressions .

  5. You forgot to make it case insensitive. Even though emails are already case insensitite (meaning any email in all caps goes to the same address as its lowercase counterpart), capital letters shouldn't make the email address invalid.


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