Instead of first selecting a file and then checking its content I would do the other order:
1. Select all files which contains the searchstring
2. replace the the tokens

1. is done with a selector: <contains>
2. your <replace> task, but with nested <fileset> from #1


<replace>
  <!-- use dir,includes,excludes for narrowing all files to a smaller amount -->
  <fileset dir="..." includes="...">
    <!-- checking the content is more expensive than checking names -->
    <contains text="${searchstring}"/>
  </fileset>
  <!-- if no file remains, 'replace' will do nothing -->
  <replacefilter token="@mytoken@(protected)}"/>
</replace>


Jan  

>-----Ursprüngliche Nachricht-----
>Von: DanVegas [mailto:dan_vegas@(protected)]
>Gesendet: Samstag, 6. Februar 2010 10:47
>An: user@(protected)
>Betreff: Conditional help
>
>
>Hi all,
>
>I'm new to using Ant and need a little help with an Task I am
>working on?
>
>In one part of it I need to check if a string does notexist in
>a certain
>file and if it doesn't then I want to add it.
>I looked through the manual/web and couldn't find any way of doing it.
>
>Pseudo code:
>...
><if>
>  <isfalse>
>    <contained in file file="${somefile}" value="${somestring}" />
>       <then>
>         <replace file="${src}/index.html">
>           <replacefilter token="@(protected)@"
>value="@mytoken@(protected)}"/>
>         </replace>
>      </then>
>  </isfalse>
></if>
>...
>
>Any help greatly appreciated
>--
>View this message in context:
>http://old.nabble.com/Conditional-help-tp27477844p27477844.html
>Sent from the Ant - Users mailing list archive at Nabble.com.
>
>
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