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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>ReplaceRegExp Task</title>
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</head>
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<body>
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<h2 id="replaceregexp">ReplaceRegExp</h2>
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<h3>Description</h3>
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<p><code>ReplaceRegExp</code> is a directory based task for replacing the occurrence of a given
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regular expression with a substitution pattern in a selected file or set of files.</p>
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<p>The output file is only written if it differs from the existing file. This prevents spurious
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rebuilds based on unchanged files which have been regenerated by this task.</p>
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<p>Similar to <a href="../Types/mapper.html#regexp-mapper">regexp type mappers</a> this task needs a
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supporting regular expression library and an implementation
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of <code class="code">org.apache.tools.ant.util.regexp.Regexp</code>. See details in the
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documentation of the <a href="../Types/regexp.html#implementation">Regexp Type</a>.</p>
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<h3>Parameters</h3>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>file</td>
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<td>file for which the regular expression should be replaced.</td>
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<td>Yes, unless nested <code><fileset></code> is used</td>
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</tr>
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<tr>
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<td>match</td>
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<td>The regular expression pattern to match in the file(s)</td>
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<td>Yes, unless nested <code><regexp></code> is used</td>
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</tr>
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<tr>
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<td>replace</td>
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<td>The substitution pattern to place in the file(s) in place of the regular expression.</td>
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<td>Yes, unless nested <code><substitution></code> is used</td>
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</tr>
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<tr>
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<td>flags</td>
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<td>The flags to use when matching the regular expression. For more information, consult the
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Perl 5 syntax<br/>
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<q>g</q> : Global replacement. Replace all occurrences found<br/>
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<q>i</q> : Case Insensitive. Do not consider case in the match<br/>
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<q>m</q> : Multiline. Treat the string as multiple lines of input, using <q>^</q>
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and <q>$</q> as the start or end of any line, respectively, rather than start or end of
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string.<br/>
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<q>s</q> : Singleline. Treat the string as a single line of input, using <q>.</q> to match
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any character, including a newline, which normally, it would not match.
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</td>
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<td>No</td>
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</tr>
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<tr>
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<td>byline</td>
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<td>Process the file(s) one line at a time, executing the replacement on one line at a time
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(<q>true|false</q>). This is useful if you want to only replace the first occurrence of a
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regular expression on each line, which is not easy to do when processing the file as a
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whole.</td>
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<td>No; defaults to <q>false</q></td>
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</tr>
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<tr>
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<td>encoding</td>
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<td>The encoding of the file. <em>since Apache Ant 1.6</em></td>
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<td>No; defaults to default JVM character encoding</td>
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</tr>
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<tr>
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<td>preserveLastModified</td>
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<td>Keep the file timestamp(s) even if the file(s) is(are) modified. <em>since Ant
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1.8.0</em>.</td>
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<td>No; defaults to <q>false</q></td>
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</tr>
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</table>
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<h3>Examples</h3>
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<pre>
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<replaceregexp file="${src}/build.properties"
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match="OldProperty=(.*)"
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replace="NewProperty=\1"
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byline="true"/></pre>
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<p>replaces occurrences of the property name <q>OldProperty</q> with <q>NewProperty</q> in a
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properties file, preserving the existing value, in the file <samp>${src}/build.properties</samp></p>
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<h3>Parameters specified as nested elements</h3>
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<p>This task supports a nested <a href="../Types/fileset.html">FileSet</a> element.</p>
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<p><em>Since Ant 1.8.0</em>, this task supports any filesystem
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based <a href="../Types/resources.html#collection">resource collections</a> as nested elements.</p>
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<p>This task supports a nested <a href="../Types/regexp.html">Regexp</a> element to specify the
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regular expression. You can use this element to refer to a previously defined regular expression
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datatype instance.</p>
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<pre>
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<regexp id="id" pattern="alpha(.+)beta"/>
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<regexp refid="id"/></pre>
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<p>This task supports a nested <code>substitution</code> element to specify the substitution
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pattern. You can use this element to refer to a previously defined substitution pattern datatype
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instance.</p>
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<pre>
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<substitution id="id" expression="beta\1alpha"/><br/>
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<substitution refid="id"/></pre>
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<h3>Examples</h3>
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<p>Replace occurrences of the property name <q>OldProperty</q> with <q>NewProperty</q> in a
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properties file, preserving the existing value, in all files ending in <samp>.properties</samp> in
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the current directory:</p>
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<pre>
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<replaceregexp byline="true">
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<regexp pattern="OldProperty=(.*)"/>
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<substitution expression="NewProperty=\1"/>
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<fileset dir=".">
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<include name="*.properties"/>
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</fileset>
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</replaceregexp></pre>
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<p>Replace all whitespaces (blanks, tabs, etc) by one blank remaining the line separator:</p>
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<pre>
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<replaceregexp match="\s+" replace=" " flags="g" byline="true">
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<fileset dir="${html.dir}" includes="**/*.html"/>
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</replaceregexp></pre>
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<p>Then, input</p>
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<pre>
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<html> <body>
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<<TAB>><h1> T E S T </h1> <<TAB>>
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<<TAB>> </body></html></pre>
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<p>is converted to</p>
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<pre>
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<html> <body>
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<h1> T E S T </h1> </body></html></pre>
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<p>The task</p>
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<pre>
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<replaceregexp match="\\n" replace="${line.separator}" flags="g" byline="true">
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<fileset dir="${dir}"/>
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</replaceregexp></pre>
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<p>replaces all <q>\n</q> markers (beware the quoting of the backslash) by a line break. Then,
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input</p>
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<pre>one\ntwo\nthree</pre>
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<p>is converted to</p>
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<pre>
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one
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two
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three</pre>
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<p>Beware that inserting line breaks could break file syntax. For example in XML:</p>
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<pre>
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<root>
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<text>line breaks \n should work in text</text>
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<attribute value="but breaks \n attributes"/>
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</root></pre>
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</body>
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</html>
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