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1. 常用替换用法
:s/old/new/:替换当前行第一个匹配的 old 为 new。
:s/old/new/g:替换当前行所有匹配的 old 为 new。
:%s/old/new/g:替换文件中所有行(全局)的 old 为 new。
:%s/old/new/gc:全局替换,但在每次替换前提示确认 (c)。