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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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/**
* 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;