From 9bf1bdaf25b8dab9b87ec9735b8fd0a3daa06433 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 12 Apr 2019 19:43:16 -0700
Subject: [PATCH] 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 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/org-table.el b/lisp/org-table.el
index 54ab25e3f..64c02b541 100644
--- a/lisp/org-table.el
+++ b/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