extract the hex color for the current line in "list-faces-display"

test.el

(defun extract-hex-code-current-line ()
  (interactive)
  (let ((line (buffer-substring-no-properties (line-beginning-position) (line-end-position))))
    (when (string-match "#\\([0-9a-fA-F]\\{6\\}\\)" line)
      (let ((hex-code (match-string 1 line)))
        (kill-new hex-code)  ; Copy the hex code to the kill ring
        (message "Copied hex code: %s" hex-code)))))  ; Optional: Display a message confirming the action

(with-eval-after-load 'help-mode  
  (define-key help-mode-map (kbd "C-c h") 'extract-hex-code-current-line))