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ensuring one-word usernames?

auschickauschick
edited May 2007 in Vanilla 1.0 Help
I'm having people registering usernames with spaces and apostrophes in them... and I just don't like it! Is there some way to force people to use things like - or _ instead of a space when they sign up?

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    MySchizoBuddyMySchizoBuddy
    do a preg_match_all() look for spaces and apostrophes. if true spit out error.
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