Got this right for exporting a new password based on the last 4 of social as related to information directly in the system:
<quer:projection alias="NewPassword" xmlns:quer="http://www.taleo.com/ws/integration/query">
<quer:concatenate>
<quer:string>Taleo</quer:string>
<quer:substring>
<quer:toChar>
<quer:customFunction name="REGEXP_REPLACE">
<quer:field path="Candidate,SocialSecurityNumber"/>
<quer:string>[^[:digit:]]</quer:string>
<quer:string/>
</quer:customFunction>
</quer:toChar>
<quer:integer>6</quer:integer>
<quer:integer>4</quer:integer>
</quer:substring>
</quer:concatenate>
</quer:projection>
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