Quickly run occur from your previous search regex

occur-from-search.el

(defun occur-from-search ()
  "Runs occur on the regex used in the last '/' search. This is useful for capturing
all the matches (just the matches, not the whole lines) into the occur buffer so
you can do something with them.

Note: Assumes evil search, so you may need to tweak for your needs."
  (interactive)
  (let ((search-pattern evil-ex-search-pattern))
    (if search-pattern
        (let ((capture-type (if (zerop (regexp-opt-depth (nth 0 search-pattern)))
                                "\\&" ;; No subexpression so collect the entire match.
                              "\\1"))) ;; Get the first subexpression
          (occur (nth 0 search-pattern)
                 capture-type))
      (message "First search with '/'."))))

Most excellent hack!