Gerard <[EMAIL PROTECTED]> added the comment: Hi All,
I found a workaround for the re.sub method so it does not raise an exception but returns and empty string when backref-ing an empty group. This is the nutshell: When doing a search and replace with sub, replace the group represented as optional for a group represented as an alternation with one empty subexpression. So instead of this “(.+?)?” use this “(|.+?)” (without the double quotes). If there’s nothing matched by this group the empty subexpression matches. Then an empty string is returned instead of a None and the sub method is executed normally instead of raising the “unmatched group” error. A complete description is in my post: http://www.gp-net.nl/2008/07/11/solved-python-regex-raising-exception-unmatched-group/ Regards, Gerard. ---------- nosy: +gerardjp title: Unmatched Group issue -> Unmatched Group issue - workaround _______________________________________ Python tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue1519638> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
