Regular Expression Help?

[Vagabond Software]

I'm trying to validate a text box that complies with the following rules:

1) text can be blank/empty
2) non-blank text shall contain ONLY A-Z and/or 0-9
3) non-blank text shall contain a maximum of 6 characters

Here is what I have so far...

(^A-Z0-9*$){0,6}

Don't look at it too long because it is not working as desired and will only
throw you off the trail. Any help is greatly appreciated.

carl

[Martin Honnen]

Re: Regular Expression Help?



Vagabond Software wrote:
[color=blue]
> I'm trying to validate a text box that complies with the following rules:
>
> 1) text can be blank/empty
> 2) non-blank text shall contain ONLY A-Z and/or 0-9
> 3) non-blank text shall contain a maximum of 6 characters
>
> Here is what I have so far...
>
> (^A-Z0-9*$){0,6}[/color]

@"^[A-Z0-9]{0,6}$"

--

Martin Honnen --- MVP XML

http://JavaScript.FAQTs.com/

[Lance]

Re: Regular Expression Help?

> > I'm trying to validate a text box that complies with the following
rules:[color=blue][color=green]
> >
> > 1) text can be blank/empty
> > 2) non-blank text shall contain ONLY A-Z and/or 0-9
> > 3) non-blank text shall contain a maximum of 6 characters
> >
> > Here is what I have so far...
> >
> > (^A-Z0-9*$){0,6}[/color]
>
> @"^[A-Z0-9]{0,6}$"[/color]

I think you may want a space in there, if by rule one, you allow spaces:
(A-Z0-9 ){0,6}

If you only allow 6 chars, you may want to first grab a substring of the
first six chars and then apply this validation. I'm not sure by your rules
whether you need the beginning and end of string anchors....