1 /* 2 * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /** 27 * Classes for matching character sequences against patterns specified 28 * by regular expressions. 29 * 30 * <p> An instance of the {@link java.util.regex.Pattern} class 31 * represents a regular expression that is specified in string form in 32 * a syntax similar to that used by Perl. 33 * 34 * <p> Instances of the {@link java.util.regex.Matcher} class are used 35 * to match character sequences against a given pattern. Input is 36 * provided to matchers via the {@link java.lang.CharSequence} 37 * interface in order to support matching against characters from a 38 * wide variety of input sources. </p> 39 * 40 * <p> Unless otherwise noted, passing a {@code null} argument to a 41 * method in any class or interface in this package will cause a 42 * {@link java.lang.NullPointerException NullPointerException} to be 43 * thrown. 44 * 45 * <h2>Related Documentation</h2> 46 * 47 * <p> An excellent tutorial and overview of regular expressions is <a 48 * href="http://www.oreilly.com/catalog/regex/"><i>Mastering Regular 49 * Expressions</i>, Jeffrey E. F. Friedl, O'Reilly and Associates, 50 * 1997.</a> </p> 51 * 52 * @since 1.4 53 * @author Mike McCloskey 54 * @author Mark Reinhold 55 */ 56 package java.util.regex; 57