Leon Hampton <leon_hamp...@yahoo.com> added the comment:
Matthew Barnett & SilentGhost, Thank you for your prompt responses. (Really prompt. Amazing!) SilentGhost, Regarding your response, I used re.search, not re.match. When I used re.match, the regex failed. When I used re.search, it matched. Here are my tests. Your example (cut-and-pasted): x = re.match(r'(<)?(\w+@\w+(?:\.\w+)+)(?(1)>|$)', '<u...@host.com') print(x) I received 'None', the expected response. My example using search: x = re.search(r'(<)?(\w+@\w+(?:\.\w+)+)(?(1)>|$)', '<u...@host.com') print(x) I received: <re.Match object; span=(1, 14), match='u...@host.com'> I understand the re.match failing, since it always starts at the beginning of the string, but why did re.search succeed? After failing with the yes-pattern, when the regex engine backtracked to the (<)? did it decide not to match the '<' at all and skip the character? Seems like it. What do you think? I am running Python 3.7 via Spyder 4.1.1 on Windows 10. Respectfully, Leon ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue40043> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
