正则表达式和sed命令:echo 1234567890|sed 's/((?<=\d)\d{3})*\b/TEST/' [英] Regular Expression and sed command: echo 1234567890|sed 's/((?<=\d)\d{3})*\b/TEST/'

问题描述

源为1234567890，正则表达式((?<=\d)\d{3})*\b可以匹配:234567890，所以我认为 sed 应该用 TEST 替换 234567890，但结果是:1234567890，为什么?

source is 1234567890, the regular expression ((?<=\d)\d{3})*\b can match: 234567890, so i think sed should replace 234567890 with TEST, but the result is: 1234567890, why?

推荐答案

sed 不支持后视.您可以尝试 ssed(超级 sed)，它支持 perl 模式，(-R)然后您可以将 perl 样式的正则表达式传递给它.例如向前看/向后看.

look-behind is not supported by sed. you could try ssed (super sed), it supports perl mode, (-R) then you could pass perl style regex to it. e.g. look ahead/behind.

查看功能列表:

https://launchpad.net/ssed

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