替换子字符串

将此正则表达式与替换命令%s一起使用

:%s/_\d\+\.htm//g

说明（来自regex101.com）：

_ matches the character _ with index 9510 (5F16 or 1378) literally (case sensitive)
\d matches a digit (equivalent to [0-9])
\+ matches the character + with index 4310 (2B16 or 538) literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
htm matches the characters htm literally (case sensitive)
Global pattern flags 
g modifier: global. All matches (don't return after first match)

替换词

上面的正则表达式将匹配ab_123.htm中的123.htm。如果要匹配一个单词，请使用vim的 * 单词边界 * \<和\>：

:%s/\<_\d\+\.htm\>//g

(see（第10页）