[[MediaWiki:Apihelp-edit-example-undo/zh-hans]]
Fragment of a discussion from User talk:D41D8CD98F
按照MediaWiki:Apihelp-edit-param-undoafter/qqq，$1被替换成模块参数前缀（比如backlinks模块的参数前缀是bl，这个模块的所有参数名都是以bl开头的）。edit模块没有参数前缀，所以$1被替换成空字符串
D41D8CD98F (talk)