How to manipulate the match data in Emacs Lisp?

September 04, 2023

(re-search-forward "foo-\\(.*\\)-baz")
(progn
  (re-search-forward "foo-\\(.*\\)-baz")
  (match-string 0))
(progn
  (re-search-forward "foo-\\(.*\\)-baz")
  (match-string 1))
(progn
  (re-search-forward "foo-\\(.*\\)-baz")
  (replace-match "^^^"))
(progn
  (re-search-forward "foo-\\(.*\\)-baz")
  (replace-match "^^^" nil nil nil 1))

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