Thank you. I made two mistakes, using square brackets when I should have use parenthesis, and thinking that a * within the square brackets would have the same effect as using a * outside the square brackets, in the normal part of the regexp.
Needless to say, it now works as I originally intended. Maybe I need to read further into the details of regexps, and to determine when one should use square brackets or (). I was under the impression that you only grouped things with () if you wished to later refer to them as a substitution string (like $1).
Thanks.