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diff --git a/src/lib/pcre/UniqueRegex.hxx b/src/lib/pcre/UniqueRegex.hxx
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+++ b/src/lib/pcre/UniqueRegex.hxx
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+/*
+ * Copyright 2007-2018 Content Management AG
+ * All rights reserved.
+ *
+ * author: Max Kellermann <mk@cm4all.com>
+ *
+ * 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.
+ *
+ * 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
+ * FOUNDATION 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.
+ */
+
+#ifndef UNIQUE_REGEX_HXX
+#define UNIQUE_REGEX_HXX
+
+#include "RegexPointer.hxx"
+#include "util/StringView.hxx"
+
+#include <algorithm>
+
+#include <pcre.h>
+
+class UniqueRegex : public RegexPointer {
+public:
+	UniqueRegex() = default;
+
+	UniqueRegex(const char *pattern, bool anchored, bool capture,
+		    bool caseless) {
+		Compile(pattern, anchored, capture, caseless);
+	}
+
+	UniqueRegex(UniqueRegex &&src) noexcept:RegexPointer(src) {
+		src.re = nullptr;
+		src.extra = nullptr;
+	}
+
+	~UniqueRegex() noexcept {
+		pcre_free(re);
+#ifdef PCRE_CONFIG_JIT
+		pcre_free_study(extra);
+#else
+		pcre_free(extra);
+#endif
+	}
+
+	UniqueRegex &operator=(UniqueRegex &&src) {
+		using std::swap;
+		swap<RegexPointer>(*this, src);
+		return *this;
+	}
+
+	/**
+	 * Throws std::runtime_error on error.
+	 */
+	void Compile(const char *pattern, bool anchored, bool capture,
+		     bool caseless);
+};
+
+#endif