javascript - Ant: how to fail if property contains a certain string -

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i want write ant macro call fail task if supplied attribute contains string. way know how string comparison in ant using javascript. have this:

<macrodef name="check-for-error">     <attribute name="input"/>     <sequential>         <echo message="@{input}"/>         <script language="javascript">             <![cdata[             var response= "@{input}";             if(response.indexof("fail") !=-1){                 project.setproperty("error","true");             }             ]]>         </script>         <fail message="input failed" if="${error}"/>     </sequential> </macrodef>

the problem approach i'm setting property global inside of javascript, , ant not let reset property. know ant has ability set local properties. how can access local properties within javascript? or there better way together?

<condition property="missing-properties">     <matches pattern="your-pattern" string="${the-attribute}"/> </condition> <fail message="input failed!" if="missing-properties"/>

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