A quick regular expression needed

Posted by Camran on Stack Overflow See other posts from Stack Overflow or by Camran
Published on 2010-06-08T16:06:37Z Indexed on 2010/06/08 16:12 UTC
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php

|

regex

I want a regular expression which ALLOWS only this:

 letter a-z
 case insensitive
 allows underscores
 allows any nrs

How should this be written?

Thanks

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