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diff --git a/src/mask.h b/src/mask.h
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+/*
+ * Copyright (c) 2003-2009, John Wiegley.  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 New Artisans LLC 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.
+ */
+
+/**
+ * @addtogroup util
+ */
+
+/**
+ * @file   mask.h
+ * @author John Wiegley
+ *
+ * @ingroup util
+ *
+ * @brief Regular expression masking.
+ */
+#ifndef _MASK_H
+#define _MASK_H
+
+#include "utils.h"
+#if defined(HAVE_BOOST_REGEX_UNICODE)
+#include "unistring.h"
+#endif
+
+namespace ledger {
+
+class mask_t
+{
+public:
+#if defined(HAVE_BOOST_REGEX_UNICODE)
+  boost::u32regex expr;
+#else
+  boost::regex expr;
+#endif
+
+  explicit mask_t(const string& pattern);
+
+  mask_t() : expr() {
+    TRACE_CTOR(mask_t, "");
+  }
+  mask_t(const mask_t& m) : expr(m.expr) {
+    TRACE_CTOR(mask_t, "copy");
+  }
+  ~mask_t() throw() {
+    TRACE_DTOR(mask_t);
+  }
+
+  mask_t& operator=(const string& other);
+
+  bool operator==(const mask_t& other) const {
+    return expr == other.expr;
+  }
+
+  bool match(const string& text) const {
+#if defined(HAVE_BOOST_REGEX_UNICODE)
+    DEBUG("mask.match",
+	  "Matching: \"" << text << "\" =~ /" << str() << "/ = "
+	  << (boost::u32regex_search(text, expr) ? "true" : "false"));
+    return boost::u32regex_search(text, expr);
+#else
+    DEBUG("mask.match",
+	  "Matching: \"" << text << "\" =~ /" << str() << "/ = "
+	  << (boost::regex_search(text, expr) ? "true" : "false"));
+    return boost::regex_search(text, expr);
+#endif
+  }
+
+  bool empty() const {
+    return expr.empty();
+  }
+
+  string str() const {
+    if (! empty()) {
+#if defined(HAVE_BOOST_REGEX_UNICODE)
+      assert(sizeof(boost::uint32_t) == sizeof(UChar32));
+      unistring ustr;
+      std::basic_string<UChar32> expr_str = expr.str();
+      std::copy(expr_str.begin(), expr_str.end(),
+		std::back_inserter(ustr.utf32chars));
+      return ustr.extract();
+#else
+      return expr.str();
+#endif
+    } else {
+      return empty_string;
+    }
+  }
+
+  bool valid() const {
+    if (expr.status() != 0) {
+      DEBUG("ledger.validate", "mask_t: expr.status() != 0");
+      return false;
+    }
+    return true;
+  }
+
+#if defined(HAVE_BOOST_SERIALIZATION)
+private:
+  /** Serialization. */
+
+  friend class boost::serialization::access;
+
+  template<class Archive>
+  void serialize(Archive& ar, const unsigned int /* version */) {
+    string temp;
+    if (Archive::is_loading::value) {
+      ar & temp;
+      *this = temp;
+    } else {
+      temp = str();
+      ar & temp;
+    }
+  }
+#endif // HAVE_BOOST_SERIALIZATION
+};
+
+inline std::ostream& operator<<(std::ostream& out, const mask_t& mask) {
+  out << mask.str();
+  return out;
+}
+
+inline void to_xml(std::ostream& out, const mask_t& mask)
+{
+  push_xml x(out, "mask");
+  out << x.guard(mask.str());
+}
+
+} // namespace ledger
+
+#endif // _MASK_H