invalid byte sequence in UTF-8 error while linting regexp with Lint/MixedCaseRange cop

[larouxn]

Running linting with the Lint/MixedCaseRange cop enabled leads to an error when linting the following regular expression line. Surely a complex line but not a range in the first place but rather a regular expression. Plus, the line has been working fine in production for months so while I'm not 100% sure it's a RuboCop issue, I'm tempted to say it is.

term.gsub(%r{[\s\.\-\–\&\,\:\;\!\?/\'\"\`\%\+\(\)\[\]]}, "").downcase

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Expected behavior

No error nor linting issue is reported when running over the above line with the aforementioned cop.

Actual behavior

Inspecting 1 file
An error occurred while Lint/MixedCaseRange cop was inspecting some_file.rb:104:16.
To see the complete backtrace run rubocop -d.
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Lint/MixedCaseRange cop was inspecting some_file.rb:104:16.
Errors are usually caused by RuboCop bugs.

Running with --debug flag, it appears the error is an invalid byte sequence. 🤔

An error occurred while Lint/MixedCaseRange cop was inspecting some_file.rb:104:16.
invalid byte sequence in UTF-8

Steps to reproduce the problem

1. Add the gsub line above to a Ruby file.
2. Run bundle exec rubocop --only Lint/MixedCaseRange --debug the_file.rb.

RuboCop version

❯ rubocop -V
1.60.2 (using Parser 3.3.0.5, rubocop-ast 1.30.0, running on ruby 3.3.0) [x86_64-linux]
  - rubocop-factory_bot 2.25.1
  - rubocop-minitest 0.34.5
  - rubocop-performance 1.20.2
  - rubocop-rails 2.23.1
  - rubocop-sorbet 0.7.7

[larouxn]

Thanks a bunch for the fix! I can confirm (on RuboCop main) that the regex line above lints fine now. 😌

Inspecting 1 file
.

1 file inspected, no offenses detected