code: func (c *FormatCheckerChain) IsFormat(name string, input interface{}) bool {
  	lock.Lock()
  	f, ok := c.formatters[name]
  	lock.Unlock()
  
  	if !ok {
  		return false
  	}
  
  	return f.IsFormat(input)
  }
docs: // IsFormat will check an input against a FormatChecker with the given name
  // to see if it is the correct format