diff --git a/include/ndnboost/regex/v4/sub_match.hpp b/include/ndnboost/regex/v4/sub_match.hpp
new file mode 100644
index 0000000..621cc83
--- /dev/null
+++ b/include/ndnboost/regex/v4/sub_match.hpp
@@ -0,0 +1,512 @@
+/*
+ *
+ * Copyright (c) 1998-2002
+ * John Maddock
+ *
+ * Use, modification and distribution are subject to the 
+ * Boost Software License, Version 1.0. (See accompanying file 
+ * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ *
+ */
+
+ /*
+  *   LOCATION:    see http://www.boost.org for most recent version.
+  *   FILE         sub_match.cpp
+  *   VERSION      see <ndnboost/version.hpp>
+  *   DESCRIPTION: Declares template class sub_match.
+  */
+
+#ifndef NDNBOOST_REGEX_V4_SUB_MATCH_HPP
+#define NDNBOOST_REGEX_V4_SUB_MATCH_HPP
+
+#ifdef NDNBOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable: 4103)
+#endif
+#ifdef NDNBOOST_HAS_ABI_HEADERS
+#  include NDNBOOST_ABI_PREFIX
+#endif
+#ifdef NDNBOOST_MSVC
+#pragma warning(pop)
+#endif
+
+namespace ndnboost{
+
+template <class BidiIterator>
+struct sub_match : public std::pair<BidiIterator, BidiIterator>
+{
+   typedef typename re_detail::regex_iterator_traits<BidiIterator>::value_type       value_type;
+#if defined(NDNBOOST_NO_STD_ITERATOR_TRAITS) || defined(NDNBOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+   typedef          std::ptrdiff_t                                                   difference_type;
+#else
+   typedef typename re_detail::regex_iterator_traits<BidiIterator>::difference_type  difference_type;
+#endif
+   typedef          BidiIterator                                                     iterator_type;
+   typedef          BidiIterator                                                     iterator;
+   typedef          BidiIterator                                                     const_iterator;
+
+   bool matched;
+
+   sub_match() : std::pair<BidiIterator, BidiIterator>(), matched(false) {}
+   sub_match(BidiIterator i) : std::pair<BidiIterator, BidiIterator>(i, i), matched(false) {}
+#if !defined(NDNBOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS)\
+               && !NDNBOOST_WORKAROUND(NDNBOOST_MSVC, < 1310)\
+               && !NDNBOOST_WORKAROUND(__BORLANDC__, <= 0x0551)\
+               && !NDNBOOST_WORKAROUND(__DECCXX_VER, NDNBOOST_TESTED_AT(60590042))
+   template <class T, class A>
+   operator std::basic_string<value_type, T, A> ()const
+   {
+      return matched ? std::basic_string<value_type, T, A>(this->first, this->second) : std::basic_string<value_type, T, A>();
+   }
+#else
+   operator std::basic_string<value_type> ()const
+   {
+      return str();
+   }
+#endif
+   difference_type NDNBOOST_REGEX_CALL length()const
+   {
+      difference_type n = matched ? ::ndnboost::re_detail::distance((BidiIterator)this->first, (BidiIterator)this->second) : 0;
+      return n;
+   }
+   std::basic_string<value_type> str()const
+   {
+      std::basic_string<value_type> result;
+      if(matched)
+      {
+         std::size_t len = ::ndnboost::re_detail::distance((BidiIterator)this->first, (BidiIterator)this->second);
+         result.reserve(len);
+         BidiIterator i = this->first;
+         while(i != this->second)
+         {
+            result.append(1, *i);
+            ++i;
+         }
+      }
+      return result;
+   }
+   int compare(const sub_match& s)const
+   {
+      if(matched != s.matched)
+         return static_cast<int>(matched) - static_cast<int>(s.matched);
+      return str().compare(s.str());
+   }
+   int compare(const std::basic_string<value_type>& s)const
+   {
+      return str().compare(s);
+   }
+   int compare(const value_type* p)const
+   {
+      return str().compare(p);
+   }
+
+   bool operator==(const sub_match& that)const
+   { return compare(that) == 0; }
+   bool NDNBOOST_REGEX_CALL operator !=(const sub_match& that)const
+   { return compare(that) != 0; }
+   bool operator<(const sub_match& that)const
+   { return compare(that) < 0; }
+   bool operator>(const sub_match& that)const
+   { return compare(that) > 0; }
+   bool operator<=(const sub_match& that)const
+   { return compare(that) <= 0; }
+   bool operator>=(const sub_match& that)const
+   { return compare(that) >= 0; }
+
+#ifdef NDNBOOST_REGEX_MATCH_EXTRA
+   typedef std::vector<sub_match<BidiIterator> > capture_sequence_type;
+
+   const capture_sequence_type& captures()const
+   {
+      if(!m_captures) 
+         m_captures.reset(new capture_sequence_type());
+      return *m_captures;
+   }
+   //
+   // Private implementation API: DO NOT USE!
+   //
+   capture_sequence_type& get_captures()const
+   {
+      if(!m_captures) 
+         m_captures.reset(new capture_sequence_type());
+      return *m_captures;
+   }
+
+private:
+   mutable ndnboost::scoped_ptr<capture_sequence_type> m_captures;
+public:
+
+#endif
+   sub_match(const sub_match& that, bool 
+#ifdef NDNBOOST_REGEX_MATCH_EXTRA
+      deep_copy
+#endif
+      = true
+      ) 
+      : std::pair<BidiIterator, BidiIterator>(that), 
+        matched(that.matched) 
+   {
+#ifdef NDNBOOST_REGEX_MATCH_EXTRA
+      if(that.m_captures)
+         if(deep_copy)
+            m_captures.reset(new capture_sequence_type(*(that.m_captures)));
+#endif
+   }
+   sub_match& operator=(const sub_match& that)
+   {
+      this->first = that.first;
+      this->second = that.second;
+      matched = that.matched;
+#ifdef NDNBOOST_REGEX_MATCH_EXTRA
+      if(that.m_captures)
+         get_captures() = *(that.m_captures);
+#endif
+      return *this;
+   }
+
+
+#ifdef NDNBOOST_OLD_REGEX_H
+   //
+   // the following are deprecated, do not use!!
+   //
+   operator int()const;
+   operator unsigned int()const;
+   operator short()const
+   {
+      return (short)(int)(*this);
+   }
+   operator unsigned short()const
+   {
+      return (unsigned short)(unsigned int)(*this);
+   }
+#endif
+};
+
+typedef sub_match<const char*> csub_match;
+typedef sub_match<std::string::const_iterator> ssub_match;
+#ifndef NDNBOOST_NO_WREGEX
+typedef sub_match<const wchar_t*> wcsub_match;
+typedef sub_match<std::wstring::const_iterator> wssub_match;
+#endif
+
+// comparison to std::basic_string<> part 1:
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator == (const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return s.compare(m.str()) == 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator != (const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return s.compare(m.str()) != 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator < (const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s,
+                 const sub_match<RandomAccessIterator>& m)
+{ return s.compare(m.str()) < 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator <= (const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return s.compare(m.str()) <= 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator >= (const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return s.compare(m.str()) >= 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator > (const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s,
+                 const sub_match<RandomAccessIterator>& m)
+{ return s.compare(m.str()) > 0; }
+// comparison to std::basic_string<> part 2:
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator == (const sub_match<RandomAccessIterator>& m,
+                  const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s)
+{ return m.str().compare(s) == 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator != (const sub_match<RandomAccessIterator>& m,
+                  const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s)
+{ return m.str().compare(s) != 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator < (const sub_match<RandomAccessIterator>& m,
+                  const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s)
+{ return m.str().compare(s) < 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator > (const sub_match<RandomAccessIterator>& m,
+                  const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s)
+{ return m.str().compare(s) > 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator <= (const sub_match<RandomAccessIterator>& m,
+                  const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s)
+{ return m.str().compare(s) <= 0; }
+template <class RandomAccessIterator, class traits, class Allocator>
+inline bool operator >= (const sub_match<RandomAccessIterator>& m,
+                  const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s)
+{ return m.str().compare(s) >= 0; }
+// comparison to const charT* part 1:
+template <class RandomAccessIterator>
+inline bool operator == (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s)
+{ return m.str().compare(s) == 0; }
+template <class RandomAccessIterator>
+inline bool operator != (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s)
+{ return m.str().compare(s) != 0; }
+template <class RandomAccessIterator>
+inline bool operator > (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s)
+{ return m.str().compare(s) > 0; }
+template <class RandomAccessIterator>
+inline bool operator < (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s)
+{ return m.str().compare(s) < 0; }
+template <class RandomAccessIterator>
+inline bool operator >= (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s)
+{ return m.str().compare(s) >= 0; }
+template <class RandomAccessIterator>
+inline bool operator <= (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s)
+{ return m.str().compare(s) <= 0; }
+// comparison to const charT* part 2:
+template <class RandomAccessIterator>
+inline bool operator == (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(s) == 0; }
+template <class RandomAccessIterator>
+inline bool operator != (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(s) != 0; }
+template <class RandomAccessIterator>
+inline bool operator < (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(s) > 0; }
+template <class RandomAccessIterator>
+inline bool operator > (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(s) < 0; }
+template <class RandomAccessIterator>
+inline bool operator <= (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(s) >= 0; }
+template <class RandomAccessIterator>
+inline bool operator >= (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(s) <= 0; }
+
+// comparison to const charT& part 1:
+template <class RandomAccessIterator>
+inline bool operator == (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s)
+{ return m.str().compare(0, m.length(), &s, 1) == 0; }
+template <class RandomAccessIterator>
+inline bool operator != (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s)
+{ return m.str().compare(0, m.length(), &s, 1) != 0; }
+template <class RandomAccessIterator>
+inline bool operator > (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s)
+{ return m.str().compare(0, m.length(), &s, 1) > 0; }
+template <class RandomAccessIterator>
+inline bool operator < (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s)
+{ return m.str().compare(0, m.length(), &s, 1) < 0; }
+template <class RandomAccessIterator>
+inline bool operator >= (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s)
+{ return m.str().compare(0, m.length(), &s, 1) >= 0; }
+template <class RandomAccessIterator>
+inline bool operator <= (const sub_match<RandomAccessIterator>& m,
+                  typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s)
+{ return m.str().compare(0, m.length(), &s, 1) <= 0; }
+// comparison to const charT* part 2:
+template <class RandomAccessIterator>
+inline bool operator == (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(0, m.length(), &s, 1) == 0; }
+template <class RandomAccessIterator>
+inline bool operator != (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(0, m.length(), &s, 1) != 0; }
+template <class RandomAccessIterator>
+inline bool operator < (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(0, m.length(), &s, 1) > 0; }
+template <class RandomAccessIterator>
+inline bool operator > (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(0, m.length(), &s, 1) < 0; }
+template <class RandomAccessIterator>
+inline bool operator <= (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(0, m.length(), &s, 1) >= 0; }
+template <class RandomAccessIterator>
+inline bool operator >= (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s,
+                  const sub_match<RandomAccessIterator>& m)
+{ return m.str().compare(0, m.length(), &s, 1) <= 0; }
+
+// addition operators:
+template <class RandomAccessIterator, class traits, class Allocator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator> 
+operator + (const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s,
+                  const sub_match<RandomAccessIterator>& m)
+{
+   std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator> result;
+   result.reserve(s.size() + m.length() + 1);
+   return result.append(s).append(m.first, m.second);
+}
+template <class RandomAccessIterator, class traits, class Allocator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator> 
+operator + (const sub_match<RandomAccessIterator>& m,
+            const std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator>& s)
+{
+   std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type, traits, Allocator> result;
+   result.reserve(s.size() + m.length() + 1);
+   return result.append(m.first, m.second).append(s);
+}
+#if !(defined(__GNUC__) && defined(NDNBOOST_NO_STD_LOCALE))
+template <class RandomAccessIterator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> 
+operator + (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{
+   std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> result;
+   result.reserve(std::char_traits<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type>::length(s) + m.length() + 1);
+   return result.append(s).append(m.first, m.second);
+}
+template <class RandomAccessIterator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> 
+operator + (const sub_match<RandomAccessIterator>& m,
+            typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const * s)
+{
+   std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> result;
+   result.reserve(std::char_traits<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type>::length(s) + m.length() + 1);
+   return result.append(m.first, m.second).append(s);
+}
+#else
+// worwaround versions:
+template <class RandomAccessIterator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> 
+operator + (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const* s,
+                  const sub_match<RandomAccessIterator>& m)
+{
+   return s + m.str();
+}
+template <class RandomAccessIterator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> 
+operator + (const sub_match<RandomAccessIterator>& m,
+            typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const * s)
+{
+   return m.str() + s;
+}
+#endif
+template <class RandomAccessIterator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> 
+operator + (typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s,
+                  const sub_match<RandomAccessIterator>& m)
+{
+   std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> result;
+   result.reserve(m.length() + 2);
+   return result.append(1, s).append(m.first, m.second);
+}
+template <class RandomAccessIterator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> 
+operator + (const sub_match<RandomAccessIterator>& m,
+            typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type const& s)
+{
+   std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> result;
+   result.reserve(m.length() + 2);
+   return result.append(m.first, m.second).append(1, s);
+}
+template <class RandomAccessIterator>
+inline std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> 
+operator + (const sub_match<RandomAccessIterator>& m1,
+            const sub_match<RandomAccessIterator>& m2)
+{
+   std::basic_string<typename re_detail::regex_iterator_traits<RandomAccessIterator>::value_type> result;
+   result.reserve(m1.length() + m2.length() + 1);
+   return result.append(m1.first, m1.second).append(m2.first, m2.second);
+}
+#ifndef NDNBOOST_NO_STD_LOCALE
+template <class charT, class traits, class RandomAccessIterator>
+std::basic_ostream<charT, traits>&
+   operator << (std::basic_ostream<charT, traits>& os,
+                const sub_match<RandomAccessIterator>& s)
+{
+   return (os << s.str());
+}
+#else
+template <class RandomAccessIterator>
+std::ostream& operator << (std::ostream& os,
+                           const sub_match<RandomAccessIterator>& s)
+{
+   return (os << s.str());
+}
+#endif
+
+#ifdef NDNBOOST_OLD_REGEX_H
+namespace re_detail{
+template <class BidiIterator, class charT>
+int do_toi(BidiIterator i, BidiIterator j, char c, int radix)
+{
+   std::string s(i, j);
+   char* p;
+   int result = std::strtol(s.c_str(), &p, radix);
+   if(*p)raise_regex_exception("Bad sub-expression");
+   return result;
+}
+
+//
+// helper:
+template <class I, class charT>
+int do_toi(I& i, I j, charT c)
+{
+   int result = 0;
+   while((i != j) && (isdigit(*i)))
+   {
+      result = result*10 + (*i - '0');
+      ++i;
+   }
+   return result;
+}
+}
+
+
+template <class BidiIterator>
+sub_match<BidiIterator>::operator int()const
+{
+   BidiIterator i = first;
+   BidiIterator j = second;
+   if(i == j)raise_regex_exception("Bad sub-expression");
+   int neg = 1;
+   if((i != j) && (*i == '-'))
+   {
+      neg = -1;
+      ++i;
+   }
+   neg *= re_detail::do_toi(i, j, *i);
+   if(i != j)raise_regex_exception("Bad sub-expression");
+   return neg;
+}
+template <class BidiIterator>
+sub_match<BidiIterator>::operator unsigned int()const
+{
+   BidiIterator i = first;
+   BidiIterator j = second;
+   if(i == j)
+      raise_regex_exception("Bad sub-expression");
+   return re_detail::do_toi(i, j, *first);
+}
+#endif
+
+} // namespace ndnboost
+
+#ifdef NDNBOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable: 4103)
+#endif
+#ifdef NDNBOOST_HAS_ABI_HEADERS
+#  include NDNBOOST_ABI_SUFFIX
+#endif
+#ifdef NDNBOOST_MSVC
+#pragma warning(pop)
+#endif
+
+#endif
+