Regexp & named capture groups (was: Parsing, BNF, TreeTop,GhostWheel, ...)
in [Ruby]
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From: Philipp Kempgen on 12 Aug 2010 14:52 Philipp Kempgen wrote: > I'm looking for a parser which can be fed with some (A)BNF-style rules. ... > If so, which parser is more appropriate? > It should hand back a parse tree. Alternatively I'd appreciate if Regexps could return *all* occurrences of named capture groups inside repetitions etc. instead of just the last match for each name. Feasible? Regards, Philipp
From: Iain Barnett on 12 Aug 2010 18:50 On 12 Aug 2010, at 19:52, Philipp Kempgen wrote: > Philipp Kempgen wrote: >> I'm looking for a parser which can be fed with some (A)BNF-style rules. > ... >> If so, which parser is more appropriate? >> It should hand back a parse tree. > > Alternatively I'd appreciate if Regexps could return *all* > occurrences of named capture groups inside repetitions etc. > instead of just the last match for each name. Feasible? > > Regards, > Philipp > I was trying to do the same thing and asked about repeated named captures. http://osdir.com/ml/ruby-talk/2010-07/msg00361.html It seems that using String#scan is the closest anything Ruby has, as the Oniguruma regex engine doesn't support it. I think it's a real shame as named capture groups are really useful. Regards, Iain
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