Issue #21709 has been updated by thyresias (Thierry Lambert). jeremyevans0 (Jeremy Evans) wrote in #note-5:
I agree this represents a bug, which is why I changed the status back to Open. However, I think the bug is in the literal Regexp support, not in `Regexp.escape`.
Thank you. I agree with your analysis of the bug origin: should I edit this to re-qualify it as "inconsistent Regexp interpolation behavior", and update the example code using your examples? ---------------------------------------- Bug #21709: Inconsistent encoding by Regexp.escape https://bugs.ruby-lang.org/issues/21709#change-115306 * Author: thyresias (Thierry Lambert) * Status: Open * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x64-mingw-ucrt] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ```ruby %w(foo être).each do |s| puts "string: #{s.inspect} -> #{s.encoding}" puts "escaped: #{Regexp.escape(s).inspect} -> #{Regexp.escape(s).encoding}" end ``` Output: ``` string: "foo" -> UTF-8 escaped: "foo" -> US-ASCII string: "être" -> UTF-8 escaped: "être" -> UTF-8 ``` The result should always match the encoding of the argument. -- https://bugs.ruby-lang.org/