"Christos Georgiou" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > On Thu, 26 Jan 2006 16:41:08 GMT, rumours say that "Roger L. Cauvin" > <[EMAIL PROTECTED]> might have written: > >>Good suggestion. Here are some "test cases": >> >>"xyz123aaabbab" accept >>"xyz123aabbaab" reject >>"xayz123aaabab" accept >>"xaaayz123abab" reject >>"xaaayz123aaabab" accept > > Applying my last regex to your test cases: > >>>> r.match("xyz123aaabbab") > <_sre.SRE_Match object at 0x00B47F60> >>>> r.match("xyz123aabbaab") >>>> r.match("xayz123aaabab") > <_sre.SRE_Match object at 0x00B50020> >>>> r.match("xaaayz123abab") >>>> r.match("xaaayz123aaabab") > <_sre.SRE_Match object at 0x00B47F60> >>>> print r.pattern > ^(?:.*?[^a])?(a{3})(?:b[ab]*)?$ > > You should also remember to check the (match_object).start(1) to verify > that > it matches the "aaa" you want.
Thanks, but the second test case I listed contained a typo. It should have contained a sequence of three of the letter 'a'. The test cases should be: "xyz123aaabbab" accept "xyz123aabbaaab" reject "xayz123aaabab" accept "xaaayz123abab" reject "xaaayz123aaabab" accept Your pattern fails the second test. -- 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
