From: ts <decoux@...>
Date: 2004-10-13T23:30:28+09:00
Subject: Re: [nuby] it seems that (?!...) doesn't work for me

>>>>> "L" == Lionel Thiry <lthiry@skynet.be> writes:

L> It seems that (?!\\) doesn't fullfill its role of "match if re in (?!re) 
L> doesn't match". What's wrong with my code?

 (?!re) is a zero-width negative look-*ahead* assertion. Apparently you
 want a zero-width negative look-*behind* assertion which is (?<!re) and
 implemented only in Oniguruma


svg% cat b.rb
#!./ruby
["${var\\}weird}", "\\${var}", "${var}"].each do |m|
   p "#{m} -- #$1" if m.match(/(?<!\\)\$\{(.*?)(?<!\\)\}/)
end
svg% 

svg% ruby b.rb
"${var\\}weird} -- var\\}weird"
"${var} -- var"
svg% 



Guy Decoux