Need to add underscore to my regex

Posted by TaMeR on Stack Overflow See other posts from Stack Overflow or by TaMeR
Published on 2010-04-16T12:02:29Z Indexed on 2010/04/16 12:13 UTC
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regex

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beginner

I suck at regular expression and just can't seem to figure this out.

'/^[A-Za-z0-9](?:.[A-Za-z0-9]+)*$/'

As it's right now it allows dots anytime after the first char and I like to add _ so that it allows both. Thanks

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