Why I get an error in this build.xml?

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Java

Java ME.

<loadproperties srcfile="${user.properties.file}">
    <filterchain>
        <replaceregex pattern="^platforms\.${platform.active}\." replace="platform."/>
        <replaceregex pattern="^deployment\.${deployment.method}\.scriptfile=" replace="deployment.scriptfile="/>
        <replaceregex pattern="^deployments\.${deployment.method}\.${deployment.instance}\.([^=]+)=" replace="\1="/>
    </filterchain>
</loadproperties>

java.util.regex.PatternSyntaxException: Illegal repetition near index 12
Error in the first line. Why?