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SSN Validation Not Working

Question asked by devingig on Aug 28, 2017
Latest reply on Feb 13, 2018 by v.reschke

Working with RegEx Validation on an SSN field in Forms, I am using the following expression

However, it only seems to except an empty field - and calls any other entry invalid.  This is a generally accepted expression referenced in multiple places and I tested it in RegEx validators.  The underlying field is Single Line of Text
What Am I doing wrong?