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+// Copyright 2014 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/text/regex.hpp
+/// Utilities to build and match regular expressions.
+
+#if !defined(UTILS_TEXT_REGEX_HPP)
+#define UTILS_TEXT_REGEX_HPP
+
+#include "utils/text/regex_fwd.hpp"
+
+#include <cstddef>
+#include <memory>
+
+
+namespace utils {
+namespace text {
+
+
+/// Container for regex match results.
+class regex_matches {
+    struct impl;
+
+    /// Pointer to shared implementation.
+    std::shared_ptr< impl > _pimpl;
+
+    friend class regex;
+    regex_matches(std::shared_ptr< impl >);
+
+public:
+    ~regex_matches(void);
+
+    std::size_t count(void) const;
+    std::string get(const std::size_t) const;
+
+    operator bool(void) const;
+};
+
+
+/// Regular expression compiler and executor.
+///
+/// All regular expressions handled by this class are "extended".
+class regex {
+    struct impl;
+
+    /// Pointer to shared implementation.
+    std::shared_ptr< impl > _pimpl;
+
+    regex(std::shared_ptr< impl >);
+
+public:
+    ~regex(void);
+
+    static regex compile(const std::string&, const std::size_t,
+                         const bool = false);
+    regex_matches match(const std::string&) const;
+};
+
+
+regex_matches match_regex(const std::string&, const std::string&,
+                          const std::size_t, const bool = false);
+
+
+}  // namespace text
+}  // namespace utils
+
+#endif  // !defined(UTILS_TEXT_REGEX_HPP)