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Regex for username

Posted on 2007-11-29
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Last Modified: 2010-04-21
Hello all,

need a pretty simple regex but my head is a bit fuzzy and can't get it working quite right...

what i need is a regex for a user name that accepts a-z, A-Z, 0-9, -, and _ but DOES NOT allow - or _ at the beginning or the end.

I have the first part: /^[a-zA-Z0-9_-]+$/

please help me add the -/_ restriction... thanks!
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Question by:bobbit31
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Accepted Solution

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ddrudik earned 125 total points
ID: 20377126
Not sure how many characters you want to allow in the name, but here's a possible option:
^[a-zA-Z0-9][a-zA-Z0-9_-]*[a-zA-Z0-9]$
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Author Closing Comment

by:bobbit31
ID: 31411795
works for me... thanks for the fast response!
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LVL 27

Expert Comment

by:ddrudik
ID: 20377211
Thanks for the question and the points.
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