grep - 搜索短语的组合

Question

使用“grep”在文本文件中搜索模式组合的方法是什么？

比如说，我正在寻找“顺便说一下”和其他可能的组合，例如“顺便说一下”和“顺便说一下”

谢谢。

Answer 1

awk 是这个工具，而不是 grep。一行：

awk '/by/ && /the/ && /way/' file

在整个文件中：

gawk -v RS='\0' '/by/ && /the/ && /way/' file

请注意，这是搜索 3 个单词，而不是搜索这 3 个单词之间有空格的组合。那是你要的吗？

如果您需要更多帮助，请提供更多详细信息，包括示例输入和预期输出。

Answer 2

The simplest approach is probably by using regexps. But this is also slightly wrong:

egrep '([ ]*(by|the|way)\>){3}'

What this does is to match on the group of your three words, taking spaces in front of the words with it (if any) and forcing it to be a complete word (hence the \> at the end) and matching the string if any of the words in the group occurs three times.

Example of running it:

$ echo -e "the the the\nby the\nby the way\nby the may\nthe way by\nby the thermo\nbypass the thermo" | egrep '([ ]*(by|the|way)\>){3}'
the the the
by the way
the way by

As already said, this procudes a 'false' positive for the the the but if you can live with that, I'd recommend doing it this way.