help xml-ifying a script attribute definition ?

[Tom Zeller]

I am looking for suggestions on how to replace the following script
attribute definition with one or more v2 built-in attribute
definitions. I think xml is easier to understand than ecma script ?

The attribute definition returns the value of returnAttr if the
sourceAttr contains a string. In other words, if foo =~ bar, return
cat.

I have looked at the Mapped, Template, and RegexSplit definitions, but
I do not think it is possible to combine them to replace this script.
Is it ?

Thanks,
TomZ

  <resolver:AttributeDefinition
    id="attr"
    xsi:type="ad:Script">
    <resolver:Dependency ref="dataConnector" />
    <ad:Script><![CDATA[
        importPackage(Packages.edu.internet2.middleware.shibboleth.common.attribute.provider);
        attr = new BasicAttribute("attr");
        if (typeof sourceAttr != "undefined" && sourceAttr != null ){
            if (sourceAttr.getValues().contains("regex")) {
                if (typeof returnAttr != "undefined" && returnAttr != null ){
                    attr.getValues().add(returnAttr.getValues().get(0));
                }
            }
        }
    ]]></ad:Script>
  </resolver:AttributeDefinition>