ScreenName validation

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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

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ScreenName validation "Mel Smith" <med_cutout_syntel@aol.com> - 2013-01-08 10:44 -0700
  Re: ScreenName validation Scott Sauyet <scott.sauyet@gmail.com> - 2013-01-08 11:02 -0800
    Re: ScreenName validation "Mel Smith" <med_cutout_syntel@aol.com> - 2013-01-08 13:05 -0700
    Re: ScreenName validation Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-11 01:28 +0100
      Re: ScreenName validation Jeff North <jnorthau@yahoo.com.au> - 2013-01-11 12:23 +1100
        Re: ScreenName validation Stefan Weiss <krewecherl@gmail.com> - 2013-01-11 03:38 +0100
        Re: ScreenName validation Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-11 20:35 +0100
          Re: ScreenName validation Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-11 21:22 +0100
            Re: ScreenName validation Stefan Weiss <krewecherl@gmail.com> - 2013-01-11 22:09 +0100
              Re: ScreenName validation Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-11 23:23 +0100
                Re: ScreenName validation Stefan Weiss <krewecherl@gmail.com> - 2013-01-12 00:26 +0100
                Re: ScreenName validation Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-12 00:54 +0100
              Re: ScreenName validation Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-12 00:22 +0100
          Re: ScreenName validation Scott Sauyet <scott.sauyet@gmail.com> - 2013-01-11 13:29 -0800
            Re: ScreenName validation Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-12 02:31 +0100

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