I'm having trouble with this script, which I'm running on Appropedia.org... it's not a huge deal if it doesn't work, but I'd appreciate if anyone has the patience to help me understand how to debug this, or *why* it doesn't work. I've narrowed it down to the \2 in the replace term, as the problem disappears when I remove it: python replace.py -regex '(?si)\b(WordPress)\b(.*$)' '\1\2\n[[Category:Appropedia WordPress site]]' -excepttext:'(?si)\[\[\s*Category:\s*Appropedia WordPress site' -excepttext:'(?si)(\#redirect\s*\[\[)' -namespace:4 -namespace:12 -summary:'add [[Category:Appropedia WordPress site]] based on search and manual check.' -log:CategoryAdd -xml:currentdump.xml Output is: Reading XML dump... Traceback (most recent call last): File "/home/cwg23/pwb/pagegenerators.py", line 1182, in __iter__ for page in self.wrapped_gen: File "/home/cwg23/pwb/pagegenerators.py", line 1039, in NamespaceFilterPageGenerator for page in generator: File "/home/cwg23/pwb/pagegenerators.py", line 1084, in DuplicateFilterPageGenerator for page in generator: File "replace.py", line 217, in __iter__ new_text = pywikibot.replaceExcept(new_text, old, new, self.excsInside, self.site) File "/home/cwg23/pwb/pywikibot/textlib.py", line 175, in replaceExcept match.group(groupID) + \ IndexError: no such group no such group 0 pages were changed. And then it gets interesting... to speed things up while debugging, I made a modified replace script called replace2.py which only loads 2 pages at a time (by setting "maxquerysize = 2" in that file). Funny thing - I can run exactly the same command but with "replace2.py" and it works... up until it gets to a particular page. Then I press n and get the error. (Btw, I've run versions of this bot in the past with only the match & replace text changed, with no problems, so it makes sense that the error only occurs in specific conditions.) The last page that it gives me is Appropedia:A Humourless Lot staging area<http://www.appropedia.org/Appropedia:A_Humourless_Lot_staging_area&… I assume the page where the problem occurs is one of the next 2 being loaded, and I don't know how to tell which pages they are. I can't see how the order of pages is determined, as it changed during my debugging/testing. Thanks for any ideas. -- Chris Watkins Appropedia.org - Sharing knowledge to build rich, sustainable lives.