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From: "Mel Smith" <med_cutout_syntel@aol.com>
Newsgroups: comp.lang.javascript
Subject: ScreenName validation
Date: Tue, 8 Jan 2013 10:44:26 -0700
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Hi:

    On a new site I'm building, I require the client (U.S., or Canadian) to 
enter his chosen 'Screen Name'.

    I wish to allow >= 2 and <= 12 characters to be input.

    I want only lowercase alpha chars along with a dot ( . ), dash( - ), and 
underscore( _ ) to be allowed.  But no whitespace should be allowed.

    At the server, I will add a 4-digit value to the chosen screenname, 
giving the screen name some uniquity, and return the corrected screen name 
to the client.

    If the user leaves the screenname field blank, I will create a 
screenname from the given and surnames (which are mandatory input fields). 
These names will be checked against a national Names database for 
verification.

    The final screen name will be something like:

        mel_s1234    // for a blank input

        or

        snow.bird1234    // where the user has entered " SNOW Bird"

Will someone suggest a Regex function for this input field.

Thanks,

-- 
Mel Smith