From 27ad285fbf2ef5a64deaa5ef66b5f72fe1dd3f62 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Fri, 10 Jun 2011 17:03:48 +0000
Subject: [PATCH] Fix access violation caused by past-the-end iterator
 deference for expressions such as ".*?".

[SVN r72540]
---
 include/boost/regex/v4/basic_regex_parser.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/regex/v4/basic_regex_parser.hpp b/include/boost/regex/v4/basic_regex_parser.hpp
index 0192a9f1..f9d4399b 100644
--- a/include/boost/regex/v4/basic_regex_parser.hpp
+++ b/include/boost/regex/v4/basic_regex_parser.hpp
@@ -941,7 +941,8 @@ bool basic_regex_parser<charT, traits>::parse_repeat(std::size_t low, std::size_
          ++m_position;
       }
       // for perl regexes only check for pocessive ++ repeats.
-      if((0 == (this->flags() & regbase::main_option_type)) 
+      if((m_position != m_end)
+         && (0 == (this->flags() & regbase::main_option_type)) 
          && (this->m_traits.syntax_type(*m_position) == regex_constants::syntax_plus))
       {
          pocessive = true;