Mask SSN as 'ZZZ-ZZ-1234' in Person Management

Summary

Mask the Social Number (SSN) in format 'ZZZ-ZZ-1234' in Person Management

Content

Team,

We have a requirement to mask SSN and show only last four digits in the below format in Person Management Screen.

Format - 'ZZZ-ZZ-1234'

Is it possible through Page composer Personalization or any other way.

I tried using JSTL functions like idexOf and Substring ..etc in expression(EL) but no luck.
#{fn:indexOf(row.NationalIdentifierNumber, "-")}

Source: https://blogs.oracle.com/jdevotnharvest/entry/using_jstl_in_adf_faces

It is giving error saying function indexOf or substring not found.

Thanks,

Madhu