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I want an regex for email that starts with numbers and letters.

My regex is 

/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/

What is wrong in this? It allows ._- from start and in between. But I don't want this

Valid emails = [email protected], [email protected], [email protected]

Invalid emails = [email protected], [email protected], [email protected], [email protected], [email protected]

Does anyone know how this can be done?

Simon Adcock
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user3301995
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    Are you aware that TLDs may have much more than 4 character length? See: http://data.iana.org/TLD/tlds-alpha-by-domain.txt – Toto Feb 13 '14 at 09:01
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    http://davidcel.is/blog/2012/09/06/stop-validating-email-addresses-with-regex/ – Bergi Feb 13 '14 at 09:06

1 Answers1

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So you dont want to have more than one ._- in your regex? And also it shall not start with ._- Try it this way:

^[a-zA-Z0-9]+[._-]?[a-zA-Z0-9]*@[a-zA-Z0-9.-]+.[a-zA-Z]{2,4}

It works for your examples, although im not really sure what email-syntax you really want to test for.

Perhaps you want to use one of many pre written examples in the web (just google ;) )

Mikescher
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