Consider something like:

(while (re-search-forward "Pattern" nil t)
(replace-match "replace"))

How can I skip all lines that contain "Skip" from this replace search? I.e. Pattern should only be replaced in such lines that doesn't contain "Skip".

(defun foo (old new out)
  "Replace matches for regexp OLD by string NEW, except in lines with string OUT."
  (while (re-search-forward old nil t)
    (unless (save-match-data
                (forward-line 0)
                (re-search-forward out (line-end-position) 'NOERROR)))
      (replace-match new))))

Then use (foo OLD NEW "Skip"), for whatever values of OLD and NEW you want.

Add args to replace-match if you don't want the automatic case-sensitivity behavior provided or if you want a literal string replacement.

  • @student, see C-h i g (elisp)Backquote – phils Sep 4 '17 at 22:01
  • Btw. What does the , mean in front of skip? – student Sep 5 '17 at 18:51
  • @phils already pointed you to info about backquote + comma syntax. See (elisp) Backquote. – Drew Sep 5 '17 at 19:28
  • As out isn't used, I can't see how this solution works. What am I missing? – Berend de Boer Aug 30 '19 at 5:12
  • @BerenddeBoer: Sorry. Should be OK now. I left a literal "Skip" in place of OUT. – Drew Aug 30 '19 at 14:38

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