How to replace regexp matches in a string in Emacs Lisp?

October 11, 2023

"^^^foo-bar^^^foo-bar" ----> "^^^bar_foo^^^bar_foo"

(replace-regexp-in-string "\\(foo\\)-\\(bar\\)" "\\2_\\1" "^^^foo-bar^^^foo-bar")
;; "^^^bar_foo^^^bar_foo"

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