From 3693a5de10c3cda47a2c8c2828e645b722aba810 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Thu, 26 Oct 2017 13:05:33 +0100
Subject: [PATCH] Regex: previous fix could go into infinite loop when a
 comment was followed by a "(", fix that.

---
 include/boost/regex/v4/basic_regex_parser.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/boost/regex/v4/basic_regex_parser.hpp b/include/boost/regex/v4/basic_regex_parser.hpp
index 3ba17246..7c2852fa 100644
--- a/include/boost/regex/v4/basic_regex_parser.hpp
+++ b/include/boost/regex/v4/basic_regex_parser.hpp
@@ -1104,8 +1104,10 @@ bool basic_regex_parser<charT, traits>::parse_repeat(std::size_t low, std::size_
                      while ((m_position != m_end)
                         && (this->m_traits.syntax_type(*m_position++) != regex_constants::syntax_close_mark)) {
                      }
+                     contin = true;
                   }
-                  contin = true;
+                  else
+                     contin = false;
                }
             }
             else