class Cucumber::CucumberExpressions::ExpressionFactory

def create_expression(string_or_regexp)
  case string_or_regexp
  when String then CucumberExpression.new(string_or_regexp, @parameter_type_registry)
  when Regexp then RegularExpression.new(string_or_regexp, @parameter_type_registry)
  else
    raise CucumberExpressionError.new("Can't create an expression from #{string_or_regexp.inspect}")
  end
end