Philippe Verdy <verd...@wanadoo.fr> added the comment: > a "general" regex (e.g. for an ipv6 address)
I know this problem, and I have already written about this. It is not possible to parse it in a single regexp if it is written without using repetitions. But in that case, the regexp becomes really HUGE, and the number of groups in the returned match object is prohibitive. That's why CPAN has had to write a specific module for IPv6 addresses in Perl. Such module can be reduced to just a couple of lines with a single regexp, if its capturing groups correctly return ALL their occurences in the regexp engine: it requires no further processing and analysis, and the data can effectively be reassembled cleanly, just from the returned groups (as lists): - \1 and \2 (for hex components of IPv6 in hex format only, where \1 can occur 0 or 1 time, and \2 can occur 0 to 7 times) - or from \1 to \2 and \3 to \4 (for hex components in \1..\2, where \1 occurs 0 or 1 time and \2 occurs 0 to 5 times, and for decimal components in \3..\4, where \3 occurs 1 time and \4 occurs exactly 3 times). ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue7132> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
