RegEx Help

The pattern needs to match what's valid, not what's invalid.
See:
http://livedocs.adobe.com/coldfusion/8/htmldocs/help.html?content=validateData_09.html#1176093
"The validation succeeds only if the user input matches the pattern."

[^\s\\]

This will match any strings that don't contain whitespace (spaces, tabs, form feeds, line feeds) and don't contain a backslash.

> I have a "UserID" field that can't have spaces or backslashes in it. I've put
> together the following reg ex but it doesn't seem to work and I'm not sure why.
> In other words, even if I type "jdoe$" (which does not have a space or
> backslash) I still get the pop-up from my cfinput. Can someone please shed some
> light?
>
> <cfinput type="text" name="UserID" size="45" required="yes" message="Please
> make sure the UserID does not have spaces or backslahes."
> validate="regular_expression" pattern="[[:space:]\\]">

Your regex pattern here has to match what you DO want, not what you don't
want. I'm also not sure JS regexes support posix-styled character classes.

I suspect you haven't thought through your requirement here. In saying
simply that the userid can't have spaces or backslashes (and approaching
the regex that way), you're implying that *any other character* is OK.

So this userid would be just fine: !"£$%^&*()_-+=. I has no spaces or
backslashes in it.

--
Adam