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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>ReplaceRegExp Task</title> </head> <body> <h2><a name="replaceregexp">ReplaceRegExp</a></h2> <h3>Description</h3> <p>ReplaceRegExp is a directory based task for replacing the occurrence of a given regular expression with a substitution pattern in a selected file or set of files.</p> <p>The output file is only written if it differs from the existing file. This prevents spurious rebuilds based on unchanged files which have been regenerated by this task.</p> <p>Similar to <a href="../CoreTypes/mapper.html#regexp-mapper">regexp type mappers</a> this task needs a supporting regular expression library and an implementation of <code>org.apache.tools.ant.util.regexp.Regexp</code>. See details in the documentation of the <a href="../CoreTypes/regexp.html#implementation">Regexp Type</a>. </p> <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">file</td> <td valign="top">file for which the regular expression should be replaced.</td> <td align="center">Yes if no nested <code><fileset></code> is used</td> </tr> <tr> <td valign="top">match</td> <td valign="top">The regular expression pattern to match in the file(s)</td> <td align="center">Yes, if no nested <code><regexp></code> is used</td> </tr> <tr> <td valign="top">replace</td> <td valign="top">The substitution pattern to place in the file(s) in place of the regular expression.</td> <td align="center">Yes, if no nested <code><substitution></code> is used</td> </tr> <tr> <td valign="top">flags</td> <td valign="top">The flags to use when matching the regular expression. For more information, consult the Perl5 syntax<br> g : Global replacement. Replace all occurrences found<br> i : Case Insensitive. Do not consider case in the match<br> m : Multiline. Treat the string as multiple lines of input, using "^" and "$" as the start or end of any line, respectively, rather than start or end of string.<br> s : Singleline. Treat the string as a single line of input, using "." to match any character, including a newline, which normally, it would not match.<br> </td> <td valign="top" align="center">No</td> </tr> <tr> <td valign="top">byline</td> <td valign="top">Process the file(s) one line at a time, executing the replacement on one line at a time (<i>true/false</i>). This is useful if you want to only replace the first occurrence of a regular expression on each line, which is not easy to do when processing the file as a whole. Defaults to <i>false</i>.</td> <td valign="top" align="center">No</td> </tr> <tr> <td valign="top">encoding</td> <td valign="top">The encoding of the file. <em>since Ant 1.6</em></td> <td align="center">No - defaults to default JVM encoding</td> </tr> <tr> <td valign="top">preserveLastModified</td> <td valign="top">Keep the file timestamp(s) even if the file(s) is(are) modified. <em>since Ant 1.8.0.</em></td> <td valign="top" align="center">No, defaults to false</td> </tr> </table> <h3>Examples</h3> <pre> <replaceregexp file="${src}/build.properties" match="OldProperty=(.*)" replace="NewProperty=\1" byline="true" /> </pre> <p>replaces occurrences of the property name "OldProperty" with "NewProperty" in a properties file, preserving the existing value, in the file <code>${src}/build.properties</code></p> <h3>Parameters specified as nested elements</h3> <p>This task supports a nested <a href="../CoreTypes/fileset.html">FileSet</a> element.</p> <p>Since Ant 1.8.0 this task supports any filesystem based <a href="../CoreTypes/resources.html#collection">resource collections</a> as nested elements.</p> <p>This task supports a nested <i><a href="../CoreTypes/regexp.html">Regexp</a></i> element to specify the regular expression. You can use this element to refer to a previously defined regular expression datatype instance.</p> <blockquote> <regexp id="id" pattern="alpha(.+)beta"/><br> <regexp refid="id"/> </blockquote> <p>This task supports a nested <i>Substitution</i> element to specify the substitution pattern. You can use this element to refer to a previously defined substitution pattern datatype instance.</p> <blockquote> <substitution id="id" expression="beta\1alpha"/><br> <substitution refid="id"/> </blockquote> <h3>Examples</h3> <blockquote> <pre> <replaceregexp byline="true"> <regexp pattern="OldProperty=(.*)"/> <substitution expression="NewProperty=\1"/> <fileset dir="."> <include name="*.properties"/> </fileset> </replaceregexp> </pre></blockquote> <p>replaces occurrences of the property name "OldProperty" with "NewProperty" in a properties file, preserving the existing value, in all files ending in <code>.properties</code> in the current directory</p> <blockquote> <pre><replaceregexp match="\s+" replace=" " flags="g" byline="true"> <fileset dir="${html.dir}" includes="**/*.html"/> </replaceregexp> </pre></blockquote> <p>replaces all whitespaces (blanks, tabs, etc) by one blank remaining the line separator. So with input <blockquote> <pre> <html> <body> <<TAB>><h1> T E S T </h1> <<TAB>> <<TAB>> </body></html> </pre></blockquote> would converted to <pre> <html> <body> <h1> T E S T </h1> </body></html> </pre> </p> </body> </html>
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