How to use Zotfile renaming to add month into file name?

ZotFile supports file renaming with even customized regex. I'm able to add a user-defined wildcard that represents the "date" field by modifying zotfile.wildcards.user to {"d":"date"}. But the extracted date is like '2016-01-06'. How can I format it as 'yymm' like 1601 using regex?
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