code: function validateMaskFormatSymbol(sNewSymbol) {
  		if (/^.$/i.test(sNewSymbol)) {
  			return true;
  		}
  		Log.error("The mask format symbol '" + sNewSymbol + "' is not valid");
  		return false;
  	}
docs: ******************************************************************************************
  ******************************** Private methods ******************************************
  ****************************************************************************************** 
  Checks if the specified symbol is valid.
  @param {string} sNewSymbol Symbol to be validated
  @returns {boolean} True if the specified symbol is valid, false otherwise
  @private