"Tim Chase" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > The below seems to pass all the tests you threw at it (taking the modified > 2nd test into consideration) > > One other test that occurs to me would be > > "xyz123aaabbaaabab" > > where you have "aaab" in there twice.
Good suggestion. > ^([^b]|((?<!a)b))*aaab+[ab]*$ Looks good, although I've been unable to find a good explanation of the "negative lookbehind" construct "(?<". How does it work? -- Roger L. Cauvin [EMAIL PROTECTED] (omit the "nospam_" part) Cauvin, Inc. Product Management / Market Research http://www.cauvin-inc.com -- http://mail.python.org/mailman/listinfo/python-list
