/usr/ is in ruby-expression-parser 0.9.1-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/expression_parser-0.9.1.gemspec
/usr/share/doc/
/usr/share/doc/ruby-expression-parser/
/usr/share/doc/ruby-expression-parser/README
/usr/share/doc/ruby-expression-parser/copyright
/usr/share/doc/ruby-expression-parser/changelog.Debian.gz
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/expression_parser/
/usr/lib/ruby/vendor_ruby/expression_parser/lexer.rb
/usr/lib/ruby/vendor_ruby/expression_parser/parser.rb
/usr/lib/ruby/vendor_ruby/expression_parser/version.rb
/usr/lib/ruby/vendor_ruby/expression_parser/token.rb
/usr/lib/ruby/vendor_ruby/expression_parser.rb