The length of the literal mask should always correspond to the length of the edit mask. If this is not the case, the edit mask is either cut off or filled with blanks up to the length of the edit mask.
字符掩码的长度要求始终与编辑掩码的长度一致。如果不一致，编辑掩码将被缩短或用空格来增加编辑掩码的长度。