From 929ee59fce2a314a28a25629e6c99402ec97603e Mon Sep 17 00:00:00 2001
From: Rob Pike <r@golang.org>
Date: Tue, 25 Mar 2014 11:19:25 +1100
Subject: [PATCH] regexp/syntax: document the upper limit of n in x{n} Fixes
 #7252.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/77990044
---
 src/pkg/regexp/syntax/doc.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/pkg/regexp/syntax/doc.go b/src/pkg/regexp/syntax/doc.go
index e52632ef72..8e72c90d3e 100644
--- a/src/pkg/regexp/syntax/doc.go
+++ b/src/pkg/regexp/syntax/doc.go
@@ -46,6 +46,10 @@ Repetitions:
   x{n,}?         n or more x, prefer fewer
   x{n}?          exactly n x
 
+Implementation restriction: The counting forms x{n} etc. (but not the other
+forms x* etc.) have an upper limit of n=1000. Negative or higher explicit
+counts yield the parse error ErrInvalidRepeatSize.
+
 Grouping:
   (re)           numbered capturing group (submatch)
   (?P<name>re)   named & numbered capturing group (submatch)
-- 
2.50.0