From: sameaton11@... Date: 2016-01-07T07:59:05+00:00 Subject: [ruby-core:72754] [Ruby trunk - Bug #4044] Regex matching errors when using \W character class and /i option Issue #4044 has been updated by Sam Eaton. Hmmm... When I try it with any other combination it never matches. Its only when I add the /i then it doesn't matter which case of "f" ~~~ "ffffFFFF".scan(/[\W]/) # [] "ffffFFFF".scan(/[\W]/i) # ["ff", "ff", "FF", "FF"] "fffFFfFF".scan(/[\W]/i) # ["ff", "fF", "Ff", "FF"] "ffffFFFF".scan(/[\W]+/i) # ["ffffFFFF"] ~~~ I tested these regular expressions with other languages (PHP, Python, JavaScript) and the result was as I expected, no matches. However when I test with Ruby the regex matches. Bug or not, I would hope this could be changed. :) ---------------------------------------- Bug #4044: Regex matching errors when using \W character class and /i option https://bugs.ruby-lang.org/issues/4044#change-56000 * Author: Ben Hoskings * Status: Closed * Priority: Normal * Assignee: Yui NARUSE * ruby -v: ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0] * Backport: ---------------------------------------- =begin Hi all, Josh Bassett and I just discovered an issue with regex matches on ruby-1.9.2p0. (We reduced it while we were hacking on gemcutter.) The case-insensitive (/i) option together with the non-word character class (\W) match inconsistently against the alphabet. Specifically the regex doesn't match properly against the letters 'k' and 's'. The following expression demonstrates the problem in irb: puts ('a'..'z').to_a.map {|c| [c, c.ord, c[/[^\W]/i] ].inspect } As a reference, the following two expressions are working properly: puts ('a'..'z').to_a.map {|c| [c, c.ord, c[/[^\W]/] ].inspect } puts ('a'..'z').to_a.map {|c| [c, c.ord, c[/[\w]/i] ].inspect } Cheers Ben Hoskings & Josh Bassett =end -- https://bugs.ruby-lang.org/ Unsubscribe: