verify_regexp_requirements

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 277
          def verify_regexp_requirements(requirements)
            requirements.each do |requirement|
              if requirement.source =~ ANCHOR_CHARACTERS_REGEX
                raise ArgumentError, "Regexp anchor characters are not allowed in routing requirements: #{requirement.inspect}"
              end

              if requirement.multiline?
                raise ArgumentError, "Regexp multiline option is not allowed in routing requirements: #{requirement.inspect}"
              end
            end
          end