I'm terrible at regular expressions. Can anyone help me?

I need to verify that a string contains at least one uppercase character, at least one lower case character, and at least one digit. It may contain more; these are minimum requirements. These required characters may be in any order in the source string.

Is there a single regular expression that will verify this? Obviously I can do it with three separate REs and then combine their results, but I'd like to do it all at once if possible.

Thanks for any help anyone can give.

Jeff Mason
Custom Apps, Inc.
www.custom-apps.com

__________________
-- Jeff

Jeff,

I've been brewing this in the back of my head since your post and I can't come up with anything useful. Every idea I have ends up being an OR condition. The only thing I could come up with was to build a big complex regex that has all six combination of character sequences (allowing for characters in between). I think you are probably better off just using three, as much as that stinks.

Peter

Jeff, I can reduce it to 2 REs with this one that verifies its not all uppercase and not all lowercase
(?!^[a-z]*$)(?!^[A-Z]*$)^[a-zA-Z0-9]+$

but I can't get the number test in there too, because a number is not upper or lower case.

Maybe someone else can add to it?

hth
Phil

Jeff, just found a likely candidate. try this one it should do it all in one go.
^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).*$

(original is at http://www.regexlib.com/REDetails.aspx?regexp_id=31)

rgds
Phil

Hang on, just discovered that the previous one allows spaces, so try this instead:
^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?!.*\s).*$

That seems to do the trick - thanks.

And thanks for the URL - that looks like it will be quite useful from time to time.

Jeff Mason
Custom Apps, Inc.
www.custom-apps.com

Guys - can you help me with this? I've taken the regexp above and tried to extend it so that it requires:

at least one lowercase
at least one uppercase
at least one of a number OR a symbol
at least 6-12 characters

^(?=.*(\d|[^a-zA-Z]))(?=.*[a-z])(?=.*[A-Z])(?!.*\s).{6,12}$

But my 'regexp' checker isn't liking it. Any ideas what is wrong with it?

Cheers,
Daniel