弄清楚了。
原文链接:https://www.f2er.com/bash/388925.html%s/\d\+/\=(submatch(0)+1)/g
http://vim.wikia.com/wiki/Using_an_expression_in_substitute_command
%s/\d\+/\=(submatch(0)+1)/g
http://vim.wikia.com/wiki/Using_an_expression_in_substitute_command