Backport commit 7ddd08bd3 from Emacs

* lisp/org-table.el (org-table-range-regexp):
Omit or rewrite useless repetitions that risk being very slow in
the backtracking regexp engine in Emacs.

Omit/rewrite useless regexp repetitions
7ddd08bd3ebc48998062a7d29274cf080256a48f
Paul Eggert
Fri Apr 12 19:43:41 2019 -0700

lisp/org-table.el

@@ -489,8 +489,8 @@ Line numbers are counted from the beginning of the table.  This
 variable is initialized with `org-table-analyze'.")
 
 (defconst org-table-range-regexp
-  "@\\([-+]?I*[-+]?[0-9]*\\)?\\(\\$[-+]?[0-9]+\\)?\\(\\.\\.@?\\([-+]?I*[-+]?[0-9]*\\)?\\(\\$[-+]?[0-9]+\\)?\\)?"
-  ;;   1                        2                    3          4                        5
+  "@\\([-+]?I*[-+]?[0-9]*\\)\\(\\$[-+]?[0-9]+\\)?\\(\\.\\.@?\\([-+]?I*[-+]?[0-9]*\\)\\(\\$[-+]?[0-9]+\\)?\\)?"
+  ;;   1                       2                    3          4                       5
   "Regular expression for matching ranges in formulas.")
 
 (defconst org-table-range-regexp2