From: ts <decoux@...>
Date: 2004-10-05T23:25:05+09:00
Subject: Re: Regexp match question on interpolated strings...

>>>>> "J" == James Edward Gray <james@grayproductions.net> writes:

J> expressions here.  Perl's regex engine has no such limitation.  Using 
J> the (?? ... ) construct, Perl regular expressions can parse balanced 
        ^^

 I've always find strange the choice for these 2 charcaters ...

J> delimiters.  I miss this feature and would love to see Ruby add 
J> something similar in the future.

 This ?

svg% cat b.rb
#!ruby -rjj
["(aaa(bbbc)xxx)", "(aaa(bb(b)c)xxx)"].each do |m|
   p $& if /(?<aa>\((?:(?>[^()]+)|\g<aa>)*\))/ =~ m
end
 /(?<aa>\((?:(?>[^()]+)|\g<aa>)*\))/.dump
svg% 

svg% ruby b.rb
"(aaa(bbbc)xxx)"
"(aaa(bb(b)c)xxx)"
Regexp /(?<aa>\((?:(?>[^()]+)|\g<aa>)*\))/
  0   call 2
  1   jump 19
  2   mem-start-push 1
  3   exact1 (
  4   push-if-peek-next ) ===> -1
  5   null-check-start 0
  6   push 13
  7   cclass-not (-) (2)
  8   push 12
  9   cclass-not (-) (2)
 10   pop
 11   jump 8
 12   jump 14
 13   call 2
 14   null-check-end-memst-push 0
 15   jump 4
 16   exact1 )
 17   mem-end-rec 1
 18   return
 19   end
Optimize EXACT : (
svg% 



Guy Decoux