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    <p>Mojo's Build-Helper Maven Plugin can help you out here.</p> <p>There are a number of goals that can be used to help transform properties.</p> <p>There is </p> <ul> <li><p><a href="http://www.mojohaus.org/build-helper-maven-plugin/regex-property-mojo.html">build-helper:regex-property</a></p></li> <li><p><a href="http://www.mojohaus.org/build-helper-maven-plugin/parse-version-mojo.html">build-helper:parse-version</a></p></li> <li><p><a href="http://www.mojohaus.org/build-helper-maven-plugin/released-version-mojo.html">build-helper:released-version</a></p></li> </ul> <p>Probably <a href="http://www.mojohaus.org/build-helper-maven-plugin/regex-property-mojo.html">regex-property</a> is the one you want, but if your version numbers conform to the "standards" the other two might save you.</p> <p>To use the <a href="http://www.mojohaus.org/build-helper-maven-plugin/regex-property-mojo.html">regex-property</a> goal you would do something like</p> <pre><code>&lt;project&gt; ... &lt;build&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt; &lt;artifactId&gt;build-helper-maven-plugin&lt;/artifactId&gt; &lt;version&gt;1.7&lt;/version&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;regex-property&lt;/id&gt; &lt;goals&gt; &lt;goal&gt;regex-property&lt;/goal&gt; &lt;/goals&gt; &lt;configuration&gt; &lt;name&gt;tag.version&lt;/name&gt; &lt;value&gt;${project.version}&lt;/value&gt; &lt;regex&gt;^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)\.(-SNAPSHOT)?$&lt;/regex&gt; &lt;replacement&gt;V$1_$2_$3_P$4&lt;/replacement&gt; &lt;failIfNoMatch&gt;true&lt;/failIfNoMatch&gt; &lt;/configuration&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; ... &lt;/project&gt; </code></pre> <p>Note: my regex might be slightly off so you should test the above.</p> <p>Note: The property value will only be available for executions after the phase that this execution is bound to. The default phase that it is bound to is <code>validate</code> but if you are on a different lifecycle (e.g. the site lifecycle) the value will not be available.</p>
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    1. POIn Maven, how can I dynamically build a property value at runtime?
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    1. USStephen Connolly
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    1. COAnd if I do not bind the plugin to a phase. I am using maven release plugin and call the goal release:prepare. How do make it available here?
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    2. COif you do not specify a phase, by default it is bound to the `validate` phase, so the code snippet above will execute the goal when the validate phase is active. when you invoke a goal directly, e.g. `release:prepare`, what happens is that maven runs the goal directly skipping any lifecycle phases, so the `release:prepare` goal itself will not see the property *but* the lifecycle *forked* by `release:prepare` will see it. So `release:prepare` will not be able to use the property for tagging SCM, but the property will be present in the forked build that the release plugin runs
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    3. COIf you want to have the SCM tag based on the property (you should update your question to reflect that this is your aim, or start a second question) then you might need to use something like http://maven.apache.org/plugins/maven-release-plugin/prepare-mojo.html#tagNameFormat though that will not give you the `_` substitution you want nor the `_P` injection. I recommend changing the tag name requirements rather than trying to bend Maven ;-)
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