A community for the timeless and infinitely powerful editor. Want to see what Emacs is capable of?!
C-h a replace-regexp , select the function, and look at its help string.
The solution will end up looking something like:
M-x replace-regexp : \([0-9]+\):\(.*\) \,(+ 1 \#1):\2
But with (format-time-string) instead of my (+1 1 \#1); I don't know time formatting functions in emacs elisp off the top of my head, sorry.
(Or use query-replace-regexp if you want interactivity.)
This same question was asked in stack exchange: https://emacs.stackexchange.com/questions/79221/is-it-possible-for-a-query-replace-regex-to-replace-the-value-with-a-computed-va
Yes, I know it's the same guy.
And how is this a meaningful answer to the question?
Is there some rule that questions asked here shouldn't be asked on stackexchange too?
Here is the solution for my .zsh_history example:
I first created a small function for the unix time string. More of the functionality in the replacement string can be included if preferred.
(defun rgx-get-time-string (unixtimestr)
(format-time-string "%Y-%m-%d %H:%M" (string-to-number unixtimestr))
)
The search string: \(: \)\([0-9]\{10\}\)\(:0;\)
The replacement string: \,(concat (format "%6d " (line-number-at-pos)) (rgx-get-time-string (match-string 2)) " "))
(match-string 2) is an alternative for the back reference for the second string matched\2