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| 2 |
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| 3 | <head>
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| 4 | <meta http-equiv="Content-Language" content="en-us">
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| 5 | <title>ReplaceRegExp Task</title>
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| 6 | <link rel="stylesheet" type="text/css" href="../stylesheets/antmanual.css">
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| 7 | </head>
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| 8 | <body>
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| 9 |
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| 10 | <h2><a name="replaceregexp">ReplaceRegExp</a></h2>
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| 11 | <h3>Description</h3>
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| 12 | <p>ReplaceRegExp is a directory based task for replacing the
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| 13 | occurrence of a given regular expression with a substitution pattern
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| 14 | in a selected file or set of files.</p>
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| 15 |
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| 16 | <p>The output file is only written if it differs from the existing
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| 17 | file. This prevents spurious rebuilds based on unchanged files which
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| 18 | have been regenerated by this task.</p>
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| 19 |
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| 20 | <p>Similar to <a href="../CoreTypes/mapper.html#regexp-mapper">regexp
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| 21 | type mappers</a> this task needs a supporting regular expression
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| 22 | library and an implementation of
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| 23 | <code>org.apache.tools.ant.util.regexp.Regexp</code>.
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| 24 | See details in the documentation of the <a href=../CoreTypes/regexp.html#implementation">Regexp Type</a>. </p>
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| 25 |
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| 26 | <h3>Parameters</h3>
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| 27 | <table border="1" cellpadding="2" cellspacing="0">
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| 28 | <tr>
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| 29 | <td valign="top"><b>Attribute</b></td>
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| 30 | <td valign="top"><b>Description</b></td>
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| 31 | <td align="center" valign="top"><b>Required</b></td>
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| 32 | </tr>
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| 33 | <tr>
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| 34 | <td valign="top">file</td>
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| 35 | <td valign="top">file for which the regular expression should be replaced.</td>
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| 36 | <td align="center">Yes if no nested <code><fileset></code> is used</td>
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| 37 | </tr>
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| 38 | <tr>
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| 39 | <td valign="top">match</td>
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| 40 | <td valign="top">The regular expression pattern to match in the file(s)</td>
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| 41 | <td align="center">Yes, if no nested <code><regexp></code> is used</td>
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| 42 | </tr>
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| 43 | <tr>
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| 44 | <td valign="top">replace</td>
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| 45 | <td valign="top">The substitution pattern to place in the file(s) in place
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| 46 | of the regular expression.</td>
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| 47 | <td align="center">Yes, if no nested <code><substitution></code> is used</td>
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| 48 | </tr>
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| 49 | <tr>
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| 50 | <td valign="top">flags</td>
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| 51 | <td valign="top">The flags to use when matching the regular expression. For more
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| 52 | information, consult the Perl5 syntax<br />
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| 53 | g : Global replacement. Replace all occurrences found<br />
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| 54 | i : Case Insensitive. Do not consider case in the match<br />
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| 55 | m : Multiline. Treat the string as multiple lines of input, using "^" and "$" as the start or end of any line, respectively, rather than start or end of string.<br />
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| 56 | s : Singleline. Treat the string as a single line of input, using "." to match any character, including a newline, which normally, it would not match.<br />
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| 57 | </td>
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| 58 | <td valign="top" align="center">No</td>
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| 59 | </tr>
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| 60 | <tr>
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| 61 | <td valign="top">byline</td>
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| 62 | <td valign="top">Process the file(s) one line at a time, executing the replacement
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| 63 | on one line at a time (<i>true/false</i>). This is useful if you
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| 64 | want to only replace the first occurrence of a regular expression on
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| 65 | each line, which is not easy to do when processing the file as a whole.
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| 66 | Defaults to <i>false</i>.</td>
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| 67 | <td valign="top" align="center">No</td>
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| 68 | </tr>
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| 69 | <tr>
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| 70 | <td valign="top">encoding</td>
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| 71 | <td valign="top">The encoding of the file. <em>since Ant 1.6</em></td>
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| 72 | <td align="center">No - defaults to default JVM encoding</td>
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| 73 | </tr>
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| 74 | </table>
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| 75 | <h3>Examples</h3>
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| 76 | <pre> <replaceregexp file="${src}/build.properties"
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| 77 | match="OldProperty=(.*)"
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| 78 | replace="NewProperty=\1"
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| 79 | byline="true"/>
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| 80 | </pre>
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| 81 | <p>replaces occurrences of the property name "OldProperty"
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| 82 | with "NewProperty" in a properties file, preserving the existing
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| 83 | value, in the file <code>${src}/build.properties</code></p>
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| 84 |
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| 85 | <h3>Parameters specified as nested elements</h3>
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| 86 | <p>This task supports a nested <a href="../CoreTypes/fileset.html">FileSet</a>
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| 87 | element.</p>
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| 88 | <p>This task supports a nested <i><a href="../CoreTypes/regexp.html">Regexp</a></i> element to specify
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| 89 | the regular expression. You can use this element to refer to a previously
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| 90 | defined regular expression datatype instance.</p>
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| 91 | <blockquote>
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| 92 | <regexp id="id" pattern="alpha(.+)beta"/><br />
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| 93 | <regexp refid="id"/>
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| 94 | </blockquote>
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| 95 | <p>This task supports a nested <i>Substitution</i> element to specify
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| 96 | the substitution pattern. You can use this element to refer to a previously
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| 97 | defined substitution pattern datatype instance.</p>
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| 98 | <blockquote>
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| 99 | <substitution id="id" expression="beta\1alpha"/><br />
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| 100 | <substitution refid="id"/>
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| 101 | </blockquote>
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| 102 | <h3>Examples</h3>
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| 103 | <blockquote>
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| 104 | <pre>
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| 105 | <replaceregexp byline="true">
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| 106 | <regexp pattern="OldProperty=(.*)"/>
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| 107 | <substitution expression="NewProperty=\1"/>
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| 108 | <fileset dir=".">
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| 109 | <includes="*.properties"/>
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| 110 | </fileset>
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| 111 | </replaceregexp>
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| 112 | </pre></blockquote>
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| 113 | <p>replaces occurrences of the property name "OldProperty"
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| 114 | with "NewProperty" in a properties file, preserving the existing
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| 115 | value, in all files ending in <code>.properties</code> in the current directory</p>
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| 116 |
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| 117 | <blockquote>
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| 118 | <pre><replaceregexp match="\s+" replace=" " flags="g" byline="true">
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| 119 | <fileset dir="${html.dir}" includes="**/*.html"/>
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| 120 | </replaceregexp>
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| 121 | </pre></blockquote>
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| 122 | <p>replaces all whitespaces (blanks, tabs, etc) by one blank remaining the
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| 123 | line separator. So with input
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| 124 |
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| 125 | <blockquote>
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| 126 | <pre>
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| 127 | <html> <body>
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| 128 | <<TAB>><h1> T E S T </h1> <<TAB>>
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| 129 | <<TAB>> </body></html>
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| 130 | </pre></blockquote>
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| 131 | would converted to
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| 132 | <pre>
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| 133 | <html> <body>
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| 134 | <h1> T E S T </h1> </body></html>
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| 135 | </pre>
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| 136 | </p>
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| 137 | <hr/>
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| 138 | <p align="center">Copyright © 2001-2004 The Apache Software Foundation. All rights
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| 139 | Reserved.</p>
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| 140 |
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| 141 | </body>
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| 142 | </html>
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| 143 |
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