matchers.go
func MatchRegexp(regexp string, args ...interface{}) types.GomegaMatcher {
	return &matchers.MatchRegexpMatcher{
		Regexp: regexp,
		Args:   args,
	}
}
func MatchRegexp(regexp string, args ...interface{}) types.GomegaMatcher {
	return &matchers.MatchRegexpMatcher{
		Regexp: regexp,
		Args:   args,
	}
}
//MatchRegexp succeeds if actual is a string or stringer that matches the
//passed-in regexp.  Optional arguments can be provided to construct a regexp
//via fmt.Sprintf().