emacs：正则表达式匹配以从字符串中提取数字

Question

I am trying to match only the numbers after the following strings:

sequentialGrid: 650274
parallelGrid: 650274

My goal is to highlight the numbers, via Mx highlight-regexp after lines beginning with sequentialGrid: and parallelGrid:

Here was my attempt, using a Perl-like approach:

^sequentialGrid: \([0-9]*\).*/$1/

Unfortunately, Emacs does not support Perl functionality. Thus, I hope my request is not impossible or perhaps someone can offer a convenient workaround.

BTW I verified that ^sequentialGrid: \\([0-9]*\\).* highlights the entire line. I just need to extract the number.

Answer 1

If your goal is to add font-lock highlighting, the following expression will work:

(font-lock-add-keywords 
 nil
 '(("^\\(parallel\\|sequential\\)Grid:\\s-*\\([0-9]+\\)"
    2 font-lock-warning-face)))

The nil MODE parameter in it to the current buffer, or you could specify the mode name as a symbol. See the manual and the wiki for more on font-lock-add-keywords and font-lock-remove-keywords .