Regexp Search

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  1. [C-M-s] (or M-x isearch-forward-regexp) : incremental forward search matching regexp
  2. [C-M-r] (or M-x isearch-backward-regexp) : incremental backward search matching regexp

alternative

  1. invoke incremental search by either C-s (isearch-forward) or C-r (isearch-backward)
  2. note the I-search: prompt in the echo area
  3. type M-r
  4. note the Pending regexp I-search: prompt in the echo area