anchor.diff:          (let ((ret-parse (make-union paren-regex last-end-index)))
             (setf begin-index (get-ret 'begin ret-parse))
             (setf end-index   (get-ret 'end   ret-parse))
  -          (list begin-index end-index (+ 2 len)))
  +          (list last-end-index end-index (+ 2 len)))
           (error "deal-with-paren: ugly union!"))
         ; simple paren
         (let ((ret-parse (parse-regex paren-regex last-end-index)))
  
positive.code:   "MAKE-UNION
     make union states.
     RETURN:(lst begin-index end-index length+2)"
    (let* ((begin-index last-end-index)
           (end-index   (add-state nil '∈))
           (len         (string-length union-string))
           (split-cons (split-union union-string))
           (regex1 (car split-cons))
           (regex2 (cdr split-cons)))
      (let* ((ret-parse    (parse-regex regex1))
             (begin1-index (get-ret 'begin ret-parse))
             (end1-index   (get-ret 'end   ret-parse)))
        (setf (state-out1 (access-state begin-index)) begin1-index)
        (setf (state-out1 (access-state end1-index)) end-index))
      (let* ((ret-parse    (parse-regex regex2))
             (begin2-index (get-ret 'begin ret-parse))
             (end2-index   (get-ret 'end   ret-parse)))
        (setf (state-out2 (access-state begin-index)) begin2-index)
        (setf (state-out1 (access-state end2-index)) end-index))
      (list last-end-index end-index (+ 2 len))))
  
  
  (defun get-first-paren (regex-string)
    "GET-FIRST-PAREN
  
negative.code:                  (setf (state-out2 (access-state start)) end)
                   (setf (state-out1 (access-state paren-end)) end)
                   (setf (state-out2 (access-state paren-end)) paren-start)
                   (setf last-end-index end)
                   ))
                (t ; Simple State, algorithm: ♂
                 (if start?
                   (progn
                     (setf start? nil)
                     (let ((new-s (add-state current-char nil)))
                       (setf begin-index new-s)
                       (set-begin-end-f new-s new-s)))
                   (if (and (null (state-match (access-state last-end-index)))
                            (null (state-attrib (access-state last-end-index))))
                     (progn
                       (setf (state-match (access-state last-end-index))
                             current-char)
                       (set-begin-end-f last-end-index last-end-index))
                     (let ((new-s (add-state current-char nil)))
                       (setf (state-out1 (access-state last-end-index)) new-s)
                       (set-begin-end-f new-s new-s))))
                 )))
        (list begin-index last-end-index (+ 2 len)))))
  
  (defun get-ret (key parse-ret)
  