class Guard::Watcher::Pattern::DeprecatedRegexp

def self.show_deprecation(pattern)
  @warning_printed ||= false
  unless @warning_printed
    msg = "*" * 20 + "\nDEPRECATION WARNING!\n" + "*" * 20
    msg += <<-MSG
    You have a string in your Guardfile watch patterns that seem to
    represent a Regexp.
    Guard matches String with == and Regexp with Regexp#match.
    You should either use plain String (without Regexp special
    characters) or real Regexp.
    MSG
    UI.deprecation(msg)
    @warning_printed = true
  end
  new_regexp = Regexp.new(pattern).inspect
  UI.info "\"#{pattern}\" will be converted to #{new_regexp}\n"
end