Bug #10097
Updated by nobu (Nobuyoshi Nakada) about 10 years ago
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' # 'Š' r1 = Regexp.new("\u0161".encode('windows-1252'), Regexp::IGNORECASE) # /š/i s1 =~ r1 # => nil s2 = "\u0178".encode 'windows-1252' # 'Ÿ' r2 = Regexp.new("\u00FF".encode('windows-1252'), Regexp::IGNORECASE) # /ÿ/i s2 =~ r2 # => nil s3 = "\u00C0".encode 'windows-1252' # 'À' r3 = Regexp.new("\u00E0".encode('windows-1252'), Regexp::IGNORECASE) # /à/i s3 =~ r3 # => 0 ~~~ So case-insensitive matching works when both characters are in iso-8859-1, but not when one (ÿŸ) or both (ŠšŽžŒœ) characters are not in iso-8859-1.