[Boost-users] [regex] matchinf info with merged regex

From: Line Oddskool (oddskool_at_[hidden])
Date: 2006-07-12 05:27:59

Hi boost.regex gurus,

I'm stuck with a problem dealing with some kind of regex merging (using
boost 1.33). I don't know if the way I took is viable, so any ideas and
advice will be appreciated.

To give you some insight, i have a set of a hundred matching (ei) and
formating (ri) "rules" e.g.

e1 : (a)(?=ll)
r1 : (?1o)

e1/r1 should mean "matching 'a' of some string like 'all' should be
replaced by 'o'"

I merge all my e/r into one big regex using regex_merge (for
performance), so the resulting matching/formating regex is like :

e : e1|e2|...|en
r: r1r2...rn

I'm getting weird behaviour with this, as the resulting string is
sometimes filled with sequences like 'u4u5u6u7u8u9u' or other "trash".

So to debug this, I'd like to know which rule (i.e. which ei) matched on
what part of the string.

I'm unsure if it's possible to get some kind of iterator on the rules
that have matched using regex_merge ?

I also looked at the match_results returned by the simpler method
regex_match(), but I can't figure out how to know which part of my
matching regex matched (i.e. which ei) ?

Otherwise, is there a way to analyse or dump the matching/replacing
behaviour of such a complex regex ?

Thanks

Line.