I need to copy part of the file (with re-search-forward) to another file under the marker. I know how to use re-search-forward, but I have problems with buffer.

Am i right with my logic?

  • 1) open needed file with temp buffer
  • 2) create new buffer
  • 3) find needed lines with re-search-forward and copy them in this new buffer
  • 4) insert lines into opened file with insert-buffer-substring

Right now i have a function like this:

(defun my-insert-file-name (filename)
  (interactive "*fInsert file name: ")
    (goto-char (point-min))
    (when (re-search-forward "#here")
      (forward-line 1)
      (------something should be here-----)))
  • 1
    Are you trying to insert text from this other file in to the current buffer? Or are you trying to insert text from the current buffer in to another file? You might be able to use append-to-buffer or append-to-file but I'm not entirely clear on your requirements here.
    – glucas
    Commented May 16, 2017 at 19:54
  • Yes, i want to insert text from other file to current buffer
    – Ilya
    Commented May 16, 2017 at 21:58

1 Answer 1


If I've understood the question properly, here's a starting point:

(defun my-insert-file-name (filename)
  (interactive "*fInsert file name: ")
  (let ((buf (current-buffer)))
        (insert-file-contents filename)
        (goto-char 1)
        (re-search-forward "regexp")
        (append-to-buffer buf (point) (point-max))))))

What this is doing:

  • Set buf to the current buffer.
  • Insert the contents of filename in to a new temporary buffer.
  • Go to the top of the temporary buffer and search forward for "regexp".
  • Insert the contents of the temporary buffer from the line after the match to the end of the file back in to buf.

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