regex: move functions out of headers

Change-Id: I6a3ea61a6564195e297288d514c5a805a832e0e6
diff --git a/src/util/regex/regex-backref-matcher.cpp b/src/util/regex/regex-backref-matcher.cpp
new file mode 100644
index 0000000..b746894
--- /dev/null
+++ b/src/util/regex/regex-backref-matcher.cpp
@@ -0,0 +1,62 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2015 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "regex-backref-matcher.hpp"
+
+#include "regex-pattern-list-matcher.hpp"
+
+namespace ndn {
+
+RegexBackrefMatcher::RegexBackrefMatcher(const std::string& expr,
+                                         shared_ptr<RegexBackrefManager> backrefManager)
+  : RegexMatcher(expr, EXPR_BACKREF, backrefManager)
+{
+}
+
+RegexBackrefMatcher::~RegexBackrefMatcher()
+{
+}
+
+void
+RegexBackrefMatcher::lateCompile()
+{
+  compile();
+}
+
+void
+RegexBackrefMatcher::compile()
+{
+  if (m_expr.size() < 2)
+    throw Error("Unrecognized format: " + m_expr);
+
+  size_t lastIndex = m_expr.size() - 1;
+  if ('(' == m_expr[0] && ')' == m_expr[lastIndex]) {
+    // m_backRefManager->pushRef(this);
+
+    auto matcher = make_shared<RegexPatternListMatcher>(m_expr.substr(1, lastIndex - 1),
+                                                        m_backrefManager);
+    m_matchers.push_back(matcher);
+  }
+  else
+    throw Error("Unrecognized format: " + m_expr);
+}
+
+} // namespace ndn