From bc140f1948d639f0b9850f56c099bf93b6da0b07 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Fri, 8 Oct 2004 12:45:31 +0000
Subject: [PATCH] Added fix to ensure that expressions prefixed with \` do not
 scan through the text unnecessarily.

[SVN r25625]
---
 include/boost/regex/v4/regex_compile.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/regex/v4/regex_compile.hpp b/include/boost/regex/v4/regex_compile.hpp
index bcc457b1..0a0d8d6e 100644
--- a/include/boost/regex/v4/regex_compile.hpp
+++ b/include/boost/regex/v4/regex_compile.hpp
@@ -2100,6 +2100,8 @@ template <class charT, class traits, class Allocator>
 unsigned int BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::fixup_leading_rep(re_detail::re_syntax_base* dat, re_detail::re_syntax_base* arg_end)
 {
    unsigned int len = 0;
+   if((_restart_type >= restart_word) || (_restart_type <= restart_continue))
+      return 0;
    bool leading_lit = arg_end ? false : true;
    while(dat != arg_end)
    {