/usr/ is in ruby-valid 1.0.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/validation.rb
/usr/lib/ruby/vendor_ruby/validation/
/usr/lib/ruby/vendor_ruby/validation/version.rb
/usr/lib/ruby/vendor_ruby/validation/rule/
/usr/lib/ruby/vendor_ruby/validation/rule/uri.rb
/usr/lib/ruby/vendor_ruby/validation/rule/matches.rb
/usr/lib/ruby/vendor_ruby/validation/rule/numeric.rb
/usr/lib/ruby/vendor_ruby/validation/rule/uuid.rb
/usr/lib/ruby/vendor_ruby/validation/rule/email.rb
/usr/lib/ruby/vendor_ruby/validation/rule/not_empty.rb
/usr/lib/ruby/vendor_ruby/validation/rule/length.rb
/usr/lib/ruby/vendor_ruby/validation/rule/phone.rb
/usr/lib/ruby/vendor_ruby/validation/rule/regular_expression.rb
/usr/lib/ruby/vendor_ruby/validation/validator.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-valid/
/usr/share/doc/ruby-valid/copyright
/usr/share/doc/ruby-valid/README.md
/usr/share/doc/ruby-valid/changelog.Debian.gz
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/valid-1.0.0.gemspec