re-search-forward search for double and reverse quotation mark character

Question

Good afternoon. Difficulties with creating a regular expression for this function. Interested in finding a double quotation mark or back quotation mark. Attempts at use were unsuccessful:

(re-search-forward "\"\\|`" $z_poz t)
(re-search-forward "\"\|`" $z_poz t)
(re-search-forward "\"|`" $z_poz t)

The alternative character is followed by a back quotation mark. Thank you.

Answer 1

You need to use

"[\"`]" 

for the regexp part.

It is easier to build regular expressions with rx or rx-to-string.

Here is a demo using M-x ielm.

*** Welcome to IELM ***  Type (describe-mode) or press C-h m for help.
ELISP> (rx-to-string '(or "`" "\""))
"[\"`]"
ELISP> 

Answer 2

The function does work with the expression, the mistake was poor tracking of the position of the point. Below code

    (defun otmKvhk()
      "Отметка выражений в кавычках
    Обрабатывается выделенный регион
    Отмечается только крайние кавычки, вложения пропускаются,
    начало соответствия 'bbo# ', конец ' #obb'"
      (interactive)
      (let ((n_pozRgn (region-beginning)) (z_pozRgn (region-end)) n_svpd k_svpd)
        (goto-char n_pozRgn)
        (while (setq n_svpd (re-search-forward "\"\\|`" z_pozRgn t))
          (let ((data (match-data)))
        (unwind-protect
            (if (setq k_svpd (search-forward (match-string-no-properties 0) z_pozRgn t))
            (progn (insert " #obb")
                   (setq k_svpd (+ 5 k_svpd))
                   (setq n_svpd (- n_svpd 1))
                   (goto-char n_svpd)
                   (insert "bbo# ")
                   (setq k_svpd (+ 5 k_svpd))
                   (goto-char k_svpd)
                   (setq z_pozRgn (+ 10 z_pozRgn)))
              (error "%s" "Не найдено соответствие!")
              )
          (set-match-data data)))
          )
        (goto-char z_pozRgn))
      )