code: func NotRegexp(t TestingT, rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	match := matchRegexp(rx, str)
  
  	if match {
  		Fail(t, fmt.Sprintf("Expect \"%v\" to NOT match \"%v\"", str, rx), msgAndArgs...)
  	}
  
  	return !match
  
  }
docs: // NotRegexp asserts that a specified regexp does not match a string.
  //
  //  assert.NotRegexp(t, regexp.MustCompile("starts"), "it's starting")
  //  assert.NotRegexp(t, "^start", "it's not starting")