Howto use ReplaceRegExp in an ant script?

[Niklaus Giger <niklaus.giger@gmail.com>]

Hi

I was trying to use the following ant snippet and got an error:
>   <property name="textile2html"
> value="${basedir}/debian/textile2html.rb"/><!-- path to textile2html
> converter -->
>   <target name="doc" depends="init" 
>   description="Generate HTML from textilesource">
>   <replaceregexp
>       match="textile"
>       replace="HTML">
>       <apply executable="${textile2html}">
> 	  <srcfile/>
> 	  <arg value="--outdir=#{$target}" />
> 	  <targetfile/>
> 	  <fileset dir="${basedir}" includes="*/*.textile */*/*.textile"/>
> 	  <mapper type="regexp" from="${basedir}" to="${target}/doc" />
>       </apply>
>      </replaceregexp>
>   </target>
The error message was:
> BUILD FAILED
> /home/src/debian/elexis-2.0/debian/build.xml:32: Problem: failed to create
> task or type replaceregexp Cause: the class
> org.apache.tools.ant.taskdefs.optional.ReplaceRegExp was not found. This
> looks like one of Ant's optional components.
> Action: Check that the appropriate optional JAR exists in
>         -/usr/share/ant/lib
>         -/home/niklaus/.ant/lib
>         -a directory added on the command line with the -lib argument
>
> Do not panic, this is a common problem.
> The commonest cause is a missing JAR.
>
> This is not a bug; it is a configuration problem

I tried to find a solution via Google. Is this a problem with my local setup or 
do I have to specify (where? / how?) additional jars to be imported.  I have 
the following ant packages installed

ii  ant                                   1.7.1-4   
ii  ant-gcj                               1.7.1-4 
ii  ant-optional                          1.7.1-4
ii  ant-optional-gcj                      1.7.1-4

And I cannot figure out what should be wrong with my configuration.

Best regards

Niklaus