From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 30 Sep 2001 17:16:17 +0000 (+0000)
Subject: Clarify remark about portability of nested parenthesization.
X-Git-Tag: AUTOCONF-2.52f~88
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca6995fd295b7201a985316437b09fe73686ca35;p=thirdparty%2Fautoconf.git

Clarify remark about portability of nested parenthesization.
---

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 983520355..fe8fa2aa0 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -9129,9 +9129,9 @@ deletes only lines that contain the literal string @samp{a|b}.
 
 Anchors (@samp{^} and @samp{$}) inside groups are not portable.
 
-Nested groups are extremely portable, but there is at least one
-@command{sed} (System V/68 Base Operating System R3V7.1) that does not
-support it.
+Nested parenthesization in patterns (e.g., @samp{\(\(a*\)b*)\)}) is
+quite portable to modern hosts, but is not supported by some older
+@command{sed} implementations like SVR3.
 
 Of course the option @option{-e} is portable, but it is not needed.  No
 valid Sed program can start with a dash, so it does not help