class ActionDispatch::Routing::Mapper::Mapping

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