+ (let ((start 0)
+ ms)
+ (while (setq start (string-match "\\\\)\\|\\\\(\\|[()]" str start))
+ (setq ms (match-string-no-properties 0 str))
+ (cond ((equal ms "\\(")
+ (setq str (replace-match "(" nil t str))
+ (setq start (+ start 1)))
+ ((equal ms "\\)")
+ (setq str (replace-match ")" nil t str))
+ (setq start (+ start 1)))
+ ((equal ms "(")
+ (setq str (replace-match "\\(" nil t str))
+ (setq start (+ start 2)))
+ ((equal ms ")")
+ (setq str (replace-match "\\)" nil t str))
+ (setq start (+ start 2)))
+ (t
+ (error "unexpected"))))
+ str))