myproject/classes;myproject/lib/somecrab.zip;myproject/lib/somelib1.jar;myproject/lib/somelib2.jar;myproject/lib/somelib3.jar;

myproject/classes;myproject/lib/somelib1.jar;myproject/lib/somelib3.jar;

<pathconvert property="new.classpath" pathsep=";">
    <path refid="old.classpath" />
    <chainedmapper>
        <regexpmapper from="(.*).jar" to="1.jar" />
    </chainedmapper>
</pathconvert>

<regexpmapper from="(.*)myproject/lib/somecrab.zip;(.*)" to="12" />

^([w/]+;)((?:[w/]+.jar;)*)[w/]+.zip;?((?:[w/]+.jar;)*)$

123

<regexpmapper from="(^.*)crab.zip(.*$)" to="1bla2bla" />

myproject/classes;myproject/lib/othercrab.zip;myproject/lib/somelib1.jar;myproject/lib/somelib2.jar;myproject/lib/somelib3.jar;

myproject/lib/otherblabla