/usr/ is in ruby-email-validator 1.4.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/ruby-email-validator/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/email_validator/
/usr/lib/ruby/vendor_ruby/email_validator/strict.rb
/usr/lib/ruby/vendor_ruby/email_validator.rb
/usr/share/
/usr/share/doc/ruby-email-validator/copyright
/usr/share/doc/ruby-email-validator/changelog.Debian.gz
/usr/share/doc/ruby-email-validator/README.md
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/email_validator-1.4.0.gemspec