Issue #10097 has been updated by Martin Drst. Nobuyoshi Nakada wrote: > Is this correct? > https://github.com/nobu/ruby/compare/windows-1252 Sorry for the very slow response. Please commit. Thanks! ---------------------------------------- Bug #10097: Case-insensitive Regexp matching for Windows-1252 not working for https://bugs.ruby-lang.org/issues/10097#change-55458 * Author: Martin Drst * Status: Open * Priority: Normal * Assignee: * ruby -v: 1.9.3p545 * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN ---------------------------------------- By chance I had a look at enc/iso_8859_1.c and found ~~~C ENC_REPLICATE("Windows-1252", "ISO-8859-1") ~~~ on line 288. But this does not work for case folding: ~~~ruby # http://en.wikipedia.org/wiki/Windows-1252 s1 = "\u0160".encode 'windows-1252' # '' r1 = Regexp.new("\u0161".encode('windows-1252'), Regexp::IGNORECASE) # //i s1 =~ r1 # => nil s2 = "\u0178".encode 'windows-1252' # '' r2 = Regexp.new("\u00FF".encode('windows-1252'), Regexp::IGNORECASE) # //i s2 =~ r2 # => nil s3 = "\u00C0".encode 'windows-1252' # '' r3 = Regexp.new("\u00E0".encode('windows-1252'), Regexp::IGNORECASE) # //i s3 =~ r3 # => 0 ~~~ So case-insensitive matching works when both characters are in iso-8859-1, but not when one () or both () characters are not in iso-8859-1. -- https://bugs.ruby-lang.org/