IdPv3: Problem with back references in mapped attribute definition

[Etienne Dysli-Metref]

Hi list!

The XML schema for attribute resolver configuration says that back
references (as supported by java.util.regex.Pattern) are supported in
the ReturnValue element (see
http://shibboleth.net/schema/idp/shibboleth-attribute-resolver-ad.xsd
complexType "ValueMapType"), but I can't get this to work. I have the
following mapped attribute definition and I'm using IdP version 3.1.0.

<resolver:AttributeDefinition xsi:type="ad:Mapped"
id="eduPersonAffiliation" sourceAttributeID="eduPersonAffiliation">
[...]
  <ad:ValueMap>
    <ad:ReturnValue>member</ad:ReturnValue>
    <ad:SourceValue>staff|student|faculty|employee</ad:SourceValue>
  </ad:ValueMap>
  <ad:ValueMap>
    <ad:ReturnValue>\\1</ad:ReturnValue>
    <ad:SourceValue>(staff|student|faculty|employee)</ad:SourceValue>
  </ad:ValueMap>
</resolver:AttributeDefinition>

For an initial value of "student", I get two values: "member" and "\1"
but I would like "member" and "student". So are back references really
supported or am I doing this wrong?

Cheers,
   Etienne

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