class Cucumber::CucumberExpressions::CucumberExpression

def initialize(expression, parameter_type_registry)
  @expression = expression
  @parameter_type_registry = parameter_type_registry
  @parameter_types = []
  parser = CucumberExpressionParser.new
  ast = parser.parse(expression)
  pattern = rewrite_to_regex(ast)
  @tree_regexp = TreeRegexp.new(pattern)
end