fix regex

build.xml

@@ -91,7 +91,7 @@
         <echo message="Downloading Grails source code. If you already have a copy of the Grails source code checked out you can avoid this download by setting the grails.home system property to point to your local copy of the source. See README.txt for more information."/>
         <get src="http://github.com/grails/grails-core/zipball/master" dest="checkout/grails-src.zip" verbose="true"/>
         <unzip src="checkout/grails-src.zip" dest="checkout">
-            <mapper type="regexp" from="(grails-grails-core-[\w]*/)(.*)" to="grails-src/\2"/>
+            <mapper type="regexp" from="(grails-grails-core-\S*?/)(.*)" to="grails-src/\2"/>
         </unzip>
         <echo message="Grails source code has been downloaded to checkout/grails-src/"/>
     </target>