用sed替换字符包围的句点 [英] Replace period surrounded by characters with sed

问题描述

我正在尝试使用sed替换文本文件中的某些句点.我的文件是这样的:

I'm trying to replace certain periods within a text file using sed. My file is something like this:

a.b
aa.bb
aa. b
a . b

我想做的是用'§'替换字符前后的句点.在这种情况下，为"a.b"和"aa.bb".我已经设法用grep做到了，然后sed:

What I'm trying to do is to replace the periods that have characters right before and right after them with a '§'. In this case, "a.b" and "aa.bb". I've managed to do it with grep and then sed:

egrep '[[:alpha:]]\.[[:alpha:]]' | sed 's/\./§/g'

但这不会让我继续操作文件.如果我尝试

But that won't let me continue to manipulate the file. And if I try

sed 's/[[:alpha:]]\.[[:alpha:]]/§/g'

它将类似"a.b"的字符串替换为§"，而不是a§b".

it would replace a string like "a.b" to "§" instead of "a§b".

非常感谢您的帮助！

推荐答案

您需要捕获"零件，然后再次打印.

You need to "catch" the parts and then print them again.

sed 's/\([[:alpha:]]\)\.\([[:alpha:]]\)/\1§\2/g'

格式化 \([[::]] \.\([[::]] \)表示 XXX.YYY .然后用 \1§\ 2 打印它们，第一部分是 \ 1 ，第二部分是 \ 2 ，包裹在<代码> \(... ...).

Format \([[:alpha:]]\)\.\([[:alpha:]]\) indicates XXX.YYY. Then you print them with \1§\2, being \1 the first part, \2 the second... wrapped in between \( ... \).

如果您想了解更多信息，此参考文献可能会为您提供帮助:

If you want further information, this reference may help you: RegExp - keeping parts of a pattern in sed

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