Small refactoring

* lisp/org.el (org-make-link-regexps): Use `regexp-opt' instead of
  `mapconcat' and `regexp-quote'.

lisp/org.el

@@ -5593,59 +5593,55 @@ stacked delimiters is N.  Escaping delimiters is not possible."
 (defun org-make-link-regexps ()
   "Update the link regular expressions.
 This should be called after the variable `org-link-types' has changed."
-  (setq org-link-types-re
-	(concat
-	 "\\`\\(" (mapconcat 'regexp-quote org-link-types "\\|") "\\):")
-	org-link-re-with-space
-	(concat
-	 "<?\\(" (mapconcat 'regexp-quote org-link-types "\\|") "\\):"
-	 "\\([^" org-non-link-chars " ]"
-	 "[^" org-non-link-chars "]*"
-	 "[^" org-non-link-chars " ]\\)>?")
-	org-link-re-with-space2
-	(concat
-	 "<?\\(" (mapconcat 'regexp-quote org-link-types "\\|") "\\):"
-	 "\\([^" org-non-link-chars " ]"
-	 "[^\t\n\r]*"
-	 "[^" org-non-link-chars " ]\\)>?")
-	org-link-re-with-space3
-	(concat
-	 "<?\\(" (mapconcat 'regexp-quote org-link-types "\\|") "\\):"
-	 "\\([^" org-non-link-chars " ]"
-	 "[^\t\n\r]*\\)")
-	org-angle-link-re
-	(concat
-	 "<\\(" (mapconcat 'regexp-quote org-link-types "\\|") "\\):"
-	 "\\([^" org-non-link-chars " ]"
-	 "[^" org-non-link-chars "]*"
-	 "\\)>")
-	org-plain-link-re
-	(concat
-	 "\\<\\(" (mapconcat 'regexp-quote org-link-types "\\|") "\\):"
-	 (org-re "\\([^ \t\n()<>]+\\(?:([[:word:]0-9_]+)\\|\\([^[:punct:] \t\n]\\|/\\)\\)\\)"))
-	;;	 "\\([^]\t\n\r<>() ]+[^]\t\n\r<>,.;() ]\\)")
-	org-bracket-link-regexp
-	"\\[\\[\\([^][]+\\)\\]\\(\\[\\([^][]+\\)\\]\\)?\\]"
-	org-bracket-link-analytic-regexp
-	(concat
-	 "\\[\\["
-	 "\\(\\(" (mapconcat 'regexp-quote org-link-types "\\|") "\\):\\)?"
-	 "\\([^]]+\\)"
-	 "\\]"
-	 "\\(\\[" "\\([^]]+\\)" "\\]\\)?"
-	 "\\]")
-	org-bracket-link-analytic-regexp++
-	(concat
-	 "\\[\\["
-	 "\\(\\(" (mapconcat 'regexp-quote (cons "coderef" org-link-types) "\\|") "\\):\\)?"
-	 "\\([^]]+\\)"
-	 "\\]"
-	 "\\(\\[" "\\([^]]+\\)" "\\]\\)?"
-	 "\\]")
-	org-any-link-re
-	(concat "\\(" org-bracket-link-regexp "\\)\\|\\("
-		org-angle-link-re "\\)\\|\\("
-		org-plain-link-re "\\)")))
+  (let ((types-re (regexp-opt org-link-types t)))
+    (setq org-link-types-re
+	  (concat "\\`" types-re ":")
+	  org-link-re-with-space
+	  (concat "<?" types-re ":"
+		  "\\([^" org-non-link-chars " ]"
+		  "[^" org-non-link-chars "]*"
+		  "[^" org-non-link-chars " ]\\)>?")
+	  org-link-re-with-space2
+	  (concat "<?" types-re ":"
+		  "\\([^" org-non-link-chars " ]"
+		  "[^\t\n\r]*"
+		  "[^" org-non-link-chars " ]\\)>?")
+	  org-link-re-with-space3
+	  (concat "<?" types-re ":"
+		  "\\([^" org-non-link-chars " ]"
+		  "[^\t\n\r]*\\)")
+	  org-angle-link-re
+	  (concat "<" types-re ":"
+		  "\\([^" org-non-link-chars " ]"
+		  "[^" org-non-link-chars "]*"
+		  "\\)>")
+	  org-plain-link-re
+	  (concat
+	   "\\<" types-re ":"
+	   (org-re "\\([^ \t\n()<>]+\\(?:([[:word:]0-9_]+)\\|\\([^[:punct:] \t\n]\\|/\\)\\)\\)"))
+	  ;;	 "\\([^]\t\n\r<>() ]+[^]\t\n\r<>,.;() ]\\)")
+	  org-bracket-link-regexp
+	  "\\[\\[\\([^][]+\\)\\]\\(\\[\\([^][]+\\)\\]\\)?\\]"
+	  org-bracket-link-analytic-regexp
+	  (concat
+	   "\\[\\["
+	   "\\(" types-re ":\\)?"
+	   "\\([^]]+\\)"
+	   "\\]"
+	   "\\(\\[" "\\([^]]+\\)" "\\]\\)?"
+	   "\\]")
+	  org-bracket-link-analytic-regexp++
+	  (concat
+	   "\\[\\["
+	   "\\(" (regexp-opt (cons "coderef" org-link-types) t) ":\\)?"
+	   "\\([^]]+\\)"
+	   "\\]"
+	   "\\(\\[" "\\([^]]+\\)" "\\]\\)?"
+	   "\\]")
+	  org-any-link-re
+	  (concat "\\(" org-bracket-link-regexp "\\)\\|\\("
+		  org-angle-link-re "\\)\\|\\("
+		  org-plain-link-re "\\)"))))
 
 (org-make-link-regexps)