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+// file      : cutl/re.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_RE_HXX
+#define CUTL_RE_HXX
+
+#include <string>
+#include <iosfwd> // std::ostream
+
+#include <cutl/exception.hxx>
+#include <cutl/details/export.hxx>
+
+namespace cutl
+{
+  namespace re
+  {
+    struct LIBCUTL_EXPORT format: exception
+    {
+      virtual
+      ~format () throw ();
+
+      format (std::string const& e, std::string const& d)
+          : regex_ (e), description_ (d)
+      {
+      }
+
+      std::string const&
+      regex () const
+      {
+        return regex_;
+      }
+
+      std::string const&
+      description () const
+      {
+        return description_;
+      }
+
+      virtual char const*
+      what () const throw ();
+
+    private:
+      std::string regex_;
+      std::string description_;
+    };
+
+    // Regular expression pattern.
+    //
+    struct LIBCUTL_EXPORT regex
+    {
+      ~regex ();
+
+      regex ()
+          : impl_ (0)
+      {
+        init (0);
+      }
+
+      explicit
+      regex (std::string const& s)
+          : impl_ (0)
+      {
+        init (&s);
+      }
+
+      regex&
+      operator= (std::string const& s)
+      {
+        init (&s);
+        return *this;
+      }
+
+      regex (regex const&);
+
+      regex&
+      operator= (regex const&);
+
+    public:
+      bool
+      match (std::string const&) const;
+
+      bool
+      search (std::string const&) const;
+
+      std::string
+      replace (std::string const& s,
+               std::string const& sub,
+               bool first_only = false) const;
+
+    public:
+      std::string
+      str () const;
+
+      bool
+      empty () const;
+
+    private:
+      void
+      init (std::string const*);
+
+    private:
+      struct impl;
+      impl* impl_;
+    };
+
+    LIBCUTL_EXPORT std::ostream&
+    operator<< (std::ostream&, regex const&);
+
+    // Regular expression pattern and substituation.
+    //
+    struct LIBCUTL_EXPORT regexsub
+    {
+      typedef re::regex regex_type;
+
+      regexsub ()
+      {
+      }
+
+      // Expression is of the form /regex/substitution/ where '/' can
+      // be replaced with any delimiter. Delimiters must be escaped in
+      // regex and substitution using back slashes (e.g., "\/"). Back
+      // slashes themselves can be escaped using the double back slash
+      // sequence (e.g., "\\").
+      //
+      explicit
+      regexsub (std::string const& e)
+      {
+        init (e);
+      }
+
+      regexsub (std::string const& regex, std::string const& sub)
+          : regex_ (regex), sub_ (sub)
+      {
+      }
+
+      regexsub (regex_type const& regex, std::string const& sub)
+          : regex_ (regex), sub_ (sub)
+      {
+      }
+
+      regexsub&
+      operator= (std::string const& e)
+      {
+        init (e);
+        return *this;
+      }
+
+    public:
+      bool
+      match (std::string const& s) const
+      {
+        return regex_.match (s);
+      }
+
+      bool
+      search (std::string const& s) const
+      {
+        return regex_.search (s);
+      }
+
+      std::string
+      replace (std::string const& s, bool first_only = false) const
+      {
+        return regex_.replace (s, sub_, first_only);
+      }
+
+    public:
+      const regex_type&
+      regex () const
+      {
+        return regex_;
+      }
+
+      const std::string&
+      substitution () const
+      {
+        return sub_;
+      }
+
+      bool
+      empty () const
+      {
+        return sub_.empty () && regex_.empty ();
+      }
+
+    private:
+      void
+      init (std::string const&);
+
+    private:
+      regex_type regex_;
+      std::string sub_;
+    };
+
+    // Once-off regex execution.
+    //
+    inline bool
+    match (std::string const& s, std::string const& regex)
+    {
+      re::regex r (regex);
+      return r.match (s);
+    }
+
+    inline bool
+    search (std::string const& s, std::string const& regex)
+    {
+      re::regex r (regex);
+      return r.search (s);
+    }
+
+    inline std::string
+    replace (std::string const& s,
+             std::string const& regex,
+             std::string const& sub,
+             bool first_only = false)
+    {
+      re::regex r (regex);
+      return r.replace (s, sub, first_only);
+    }
+
+    inline std::string
+    replace (std::string const& s,
+             std::string const& regexsub, // /regex/subst/
+             bool first_only = false)
+    {
+      re::regexsub r (regexsub);
+      return r.replace (s, first_only);
+    }
+
+    // Utility function for parsing expressions in the form /regex/subst/
+    // where '/' can be replaced with any delimiter. This function handles
+    // escaping. It return the position of the next delimiter and stores
+    // the unescaped chunk in result or throws the format exception if
+    // the expression is invalid.
+    //
+    LIBCUTL_EXPORT std::string::size_type
+    parse (std::string const& s,
+           std::string::size_type start,
+           std::string& result);
+  }
+}
+
+#endif // CUTL_RE_HXX