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-<!--
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
--->
-<html>
-
-<head>
-<meta http-equiv="Content-Language" content="en-us">
-<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
-<title>Regexp Type</title>
-</head>
-
-<body>
-
-<h2><a name="regexp">Regexp</a></h2>
-<p>
-Regexp represents a regular expression.
-<h3>Parameters</h3>
-<table border="1" cellpadding="2" cellspacing="0">
- <tr>
- <td valign="top"><b>Attribute</b></td>
- <td valign="top"><b>Description</b></td>
- <td align="center" valign="top"><b>Required</b></td>
- </tr>
- <tr>
- <td valign="top">pattern</td>
- <td valign="top">regular expression pattern</td>
- <td valign="top" align="center">Yes</td>
- </tr>
-</table>
-
-<h3>Examples</h3>
-<blockquote><pre>
- &lt;regexp id="myregexp" pattern="alpha(.+)beta"/&gt;<br>
-</pre></blockquote>
-<p>
-Defines a regular expression for later use with id myregexp.
-</p>
-<blockquote><pre>
- &lt;regexp refid="myregexp"/&gt;<br>
-</pre></blockquote>
-<p>
-Use the regular expression with id myregexp.
-</p>
-<h3><a name="implementation">Choice of regular expression implementation</a></h3>
-<p>
-Apache Ant comes with
-wrappers for
-<a href="http://docs.oracle.com/javase/7/docs/api/java/util/regex/package-summary.html" target="_top">the java.util.regex package</a>,
-<a href="http://attic.apache.org/projects/jakarta-regexp.html" target="_top">jakarta-regexp</a>
-and <a href="http://attic.apache.org/projects/jakarta-oro.html" target="_top">jakarta-ORO</a>,
-See <a href="../install.html#librarydependencies">installation dependencies</a>
- concerning the supporting libraries.</p>
-<p>
-The property <code>ant.regexp.regexpimpl</code> governs which regular expression implementation will be chosen.
-Possible values for this property are :
-<ul>
-<li>
-org.apache.tools.ant.util.regexp.Jdk14RegexpRegexp
-</li>
-<li>
-org.apache.tools.ant.util.regexp.JakartaOroRegexp
-</li>
-<li>
-org.apache.tools.ant.util.regexp.JakartaRegexpRegexp
-</li>
-</ul>
-It can also be another implementation of the interface <code>org.apache.tools.ant.util.regexp.Regexp</code>.
-If <code>ant.regexp.regexpimpl</code> is not defined, Ant uses Jdk14Regexp as this is always available.</p>
-<p>
-There are cross-platform issues for matches related to line terminator.
-For example if you use $ to anchor your regular expression on the end of a line
-the results might be very different depending on both your platform and the regular
-expression library you use. It is 'highly recommended' that you test your pattern on
-both Unix and Windows platforms before you rely on it.
-<ul>
- <li>Jakarta Oro defines a line terminator as '\n' and is consistent with Perl.</li>
- <li>Jakarta RegExp uses a system-dependent line terminator.</li>
- <li>JDK 1.4 uses '\n', '\r\n', '\u0085', '\u2028', '\u2029' as a default
- but is configured in the wrapper to use only '\n' (UNIX_LINE)</li>
-</ul>
-<em>We used to recommend that you use Jakarta ORO but since its
- development has been retired Java's built-in regex package is likely
- the best choice going forward.</em>
-</p>
-<h3>Usage</h3>
-The following tasks and types use the Regexp type :
-<ul>
-<li><a href="../Tasks/replaceregexp.html">ReplaceRegExp task</a></li>
-<li><a href="filterchain.html#linecontainsregexp">LineContainsRegexp filter</a></li>
-</ul>
-<p>
-These string filters also use the mechanism of regexp to choose a regular expression implementation :
-</p>
-<ul>
-<li><a href="filterchain.html#containsregex">ContainsRegex string filter</a></li>
-<li><a href="filterchain.html#replaceregex">ReplaceRegex string filter</a></li>
-<li><a href="selectors.html#filenameselect">filename selector</a></li>
-<li><a href="resources.html#rsel.name">name resource selector</a></li>
-<li><a href="selectors.html#regexpselect">containsregexp selector</a></li>
-</ul>
-
-</body>
-</html>