后视在 sed 中工作吗? [英] Does lookbehind work in sed?

问题描述

我使用 grep 创建了一个测试，但它在 sed 中不起作用.

I created a test using grep but it does not work in sed.

grep -P '(?<=foo)bar' file.txt

通过返回 bar 可以正常工作.

This works correctly by returning bar.

sed 's/(?<=foo)bar/test/g' file.txt

我期待 footest 作为输出，但它不起作用.

I was expecting footest as output, but it did not work.

推荐答案

GNU sed 不支持环视断言.您可以使用更强大的语言，例如 Perl，也可以尝试使用支持的 ssedPerl 风格的正则表达式.

GNU sed does not have support for lookaround assertions. You could use a more powerful language such as Perl or possibly experiment with ssed which supports Perl-style regular expressions.

perl -pe 's/(?<=foo)bar/test/g' file.txt

这篇关于后视在 sed 中工作吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！