Emacs：使用正则表达式搜索缓冲区并在新缓冲区中显示结果？

Question

Supposed I had a buffer in emacs with 1000 lines, and dotted around in that buffer were unicode references (eg. \舦 ). I want to collect all those references into another buffer, which I can then sort and uniquify.

On the (*nix) command line, I can do something like:

grep -o "\\\\u[0-9]*" tmpfile | sort | uniq

Is this achievable directly within emacs, without saving any buffers to disk?

Answer 1

Go to your buffer, select it all with Cx h , then do M-| grep -o "\\\\\\\\u[0-9]*" | sort | uniq M-| grep -o "\\\\\\\\u[0-9]*" | sort | uniq M-| grep -o "\\\\\\\\u[0-9]*" | sort | uniq (this runs shell-command-on-region ). The output will go to *Shell Command Output* , which will not be shown unless the output is long enough, but it's always created and you can switch to it regardless.

There is also occur ( Ms o ).

Answer 2

 Mx occur RET [[:nonascii:]]+ RET Mx other-window Mx toggle-read-only Mx sort-lines