dmalhotr2001@yahoo.com wrote in news:449748e9-9059-46ed-bd89-934318d6e7f9
@e6g2000prf.googlegroups.com:

[A-Za-z0-9\_]*

The following expression will do what you requested:

^(?:\w|-)+$

This will match text containing numbers, letters, underscores and
dashes.  If any other characters exist in the string, it will not
match.

If you want partial matches in your string, remove the two anchors as
follows:

(?:\w|-)+

To actually learn how I created that, there are a few books explaining
regular expressions.  I like Friedl's book Master Regular Expressions.

On Mar 18, 4:08 pm, dmalhotr2...@yahoo.com wrote:

One extremely useful resource for composing regular expressions is
Expresso. It's helps me out a ton whenever I have to use Regex.

Check it out at:

http://www.ultrapico.com/Expresso.htm

Thanks,

Seth Rowe [MVP]