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How can I get GNU Emacs to automatically save all the files I've changed after doing a multi-file search/replace with query-replace-regexp? Right now I have to switch back to the buffer for every individual file and save by hand whenever I do multi-file search and replace, which is just plain annoying.

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    Not what you asked for but save-some-buffers (bound to C-x s in vanilla emacs) will save you some time. – Fran Burstall Jun 6 at 19:35
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You could trigger save-buffer after the replace. I believe the following should work:

(add-hook 'replace-update-post-hook 'save-buffer)

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