Remove rg-regexp-quote

rg.el

@@ -745,10 +745,6 @@ Example:
            (rg-rerun))
        (message "Can't refine search since full command line search was used."))))
 
-(defun rg-regexp-quote (regexp)
-  "Return an 'rg' REGEXP string which match exactly STRING and nothing else."
-  (replace-regexp-in-string "[][*.^\\|+?{}$()\]" "\\\\\\&" regexp))
-
 (defun rg-apply-case-flag (pattern)
   "Make sure -i is added to the command if needed.
 The value of the `rg-ignore-case' variable and the case of the

test/rg.el-test.el

@@ -328,17 +328,6 @@ matching alias."
       (should (equal "Some match" (match-string 0)))
       (should (eq saved-pos (point))))))
 
-(ert-deftest rg-unit/regexp-quote ()
-  "Test `rg-regexp-quote' with some 'random' strings."
-  (should (equal (rg-regexp-quote ")-[abs|]^$_+=(^\?)")
-                 "\\)-\\[abs\\|\\]\\^\\$_\\+=\\(\\^\\?\\)"))
-  (should (equal (rg-regexp-quote "(?i)a+(?-i)b+")
-                 "\\(\\?i\\)a\\+\\(\\?-i\\)b\\+"))
-  (should (equal (rg-regexp-quote "AaAaAbbBBBb")
-                 "AaAaAbbBBBb"))
-  (should (equal (rg-regexp-quote "^(.*)|{}")
-                 "\\^\\(\\.\\*\\)\\|\\{\\}")))
-
 (ert-deftest rg-unit-test/global-keymap ()
   "Test global keymap."
   ;; Default prefix