id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 17492 url backreferencing can not be reversed. Nate Bragg Nate Bragg "If a url pattern uses backreferencing (i.e., ""(?P=previously_named_group)""), the reversal fails, throwing up ""Non-reversible reg-exp portion"" ValueError. The problem occurs in django.utils.regex_helper.normalize which gives up on any character following a ""(?P"" other than ""<""." Bug closed Core (Other) 1.3 Normal fixed Unreviewed 1 0 0 0 0 0