--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/java/util/regex/package-info.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * Classes for matching character sequences against patterns specified
+ * by regular expressions.
+ *
+ * <p> An instance of the {@link java.util.regex.Pattern} class
+ * represents a regular expression that is specified in string form in
+ * a syntax similar to that used by Perl.
+ *
+ * <p> Instances of the {@link java.util.regex.Matcher} class are used
+ * to match character sequences against a given pattern.  Input is
+ * provided to matchers via the {@link java.lang.CharSequence}
+ * interface in order to support matching against characters from a
+ * wide variety of input sources. </p>
+ *
+ * <p> Unless otherwise noted, passing a <code>null</code> argument to a
+ * method in any class or interface in this package will cause a
+ * {@link java.lang.NullPointerException NullPointerException} to be
+ * thrown.
+ *
+ * <h2>Related Documentation</h2>
+ *
+ * <p> An excellent tutorial and overview of regular expressions is <a
+ * href="http://www.oreilly.com/catalog/regex/"><i>Mastering Regular
+ * Expressions</i>, Jeffrey E. F. Friedl, O'Reilly and Associates,
+ * 1997.</a> </p>
+ *
+ * @since 1.4
+ * @author Mike McCloskey
+ * @author Mark Reinhold
+ */
+package java.util.regex;