From 84ecb55cfac71a1eaef0e541443f087de45c938d Mon Sep 17 00:00:00 2001
From: Christopher Kohlhoff <chris@kohlhoff.com>
Date: Mon, 8 Jul 2024 22:58:31 +1000
Subject: [PATCH] Fix read_until's regex support when ASIO_NO_DYNAMIC_BUFFER_V1
 is defined.

---
 asio/include/asio/impl/read_until.hpp | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/asio/include/asio/impl/read_until.hpp b/asio/include/asio/impl/read_until.hpp
index 08fe3fcd9b..354a2d2040 100644
--- a/asio/include/asio/impl/read_until.hpp
+++ b/asio/include/asio/impl/read_until.hpp
@@ -68,6 +68,19 @@ namespace detail
     }
     return std::make_pair(last1, false);
   }
+
+#if !defined(ASIO_NO_EXTENSIONS)
+#if defined(ASIO_HAS_BOOST_REGEX)
+  struct regex_match_flags
+  {
+    template <typename T>
+    operator T() const
+    {
+      return T::match_default | T::match_partial;
+    }
+  };
+#endif // !defined(ASIO_NO_EXTENSIONS)
+#endif // defined(ASIO_HAS_BOOST_REGEX)
 } // namespace detail
 
 #if !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
@@ -231,19 +244,6 @@ std::size_t read_until(SyncReadStream& s,
 #if !defined(ASIO_NO_EXTENSIONS)
 #if defined(ASIO_HAS_BOOST_REGEX)
 
-namespace detail {
-
-struct regex_match_flags
-{
-  template <typename T>
-  operator T() const
-  {
-    return T::match_default | T::match_partial;
-  }
-};
-
-} // namespace detail
-
 template <typename SyncReadStream, typename DynamicBuffer_v1, typename Traits>
 inline std::size_t read_until(SyncReadStream& s, DynamicBuffer_v1&& buffers,
     const boost::basic_regex<char, Traits>& expr,