i am trying to write an regular expression for username n password where :-

username
allow a-z, A-Z, 0-9 and including _ ( under score ) only

password
allow a-z, A-Z, 0-9 only

pls help me

This post has been edited by eueu: Jan 19 2006, 01:02 PM

erm....pls try check at google...www.regexlib.com oso have quite some example of it...

What if... \w+

This post has been edited by visual: Jan 19 2006, 02:45 PM

^[a-zA-Z0-9_]{6,30}$

i make myself 1 ... if i give a "space" in the textbox without any other number or word. it let me pass the regex but not show me error. how to conrrect this?

You can use RequiredFieldValidator for your matter

Hope this helps...

try to trim it first b4 u pass the string to the regex to validate.

^[a-zA-Z0-9]+ will accept anything in alphanumeric range

how to force it to use alpha + numeric?

^[[a-zA-Z]+[0-9]+] will do?