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While attempt to delete [[Category:C++]] on http://translatewiki.net/w/i.php?oldid=1497848 using js2/ajaxcategories.js, firefox gives:

Error: invalid quantifier +(\|[^\]]*)?\]\]
Source File:  http://translatewiki.net/w/mwScriptLoader.php?class=LanguageSelector,SlippyMap,ajax,mwsuggest,ajaxCategories,WT:-|useskin=Modern&urid=240bw-3_1252705792
Line: 171

Seems the regex cannot escape the '+' in category name.

Yes, it's a regex escaping issue. Looks like we'll have to home-grow a regex escaping function.

I think removing categories in JavaScript is not a good idea because of that complex MediaWiki syntax...

Assigning my self, fixed in local trunk

r92112