Predicate to do regex match against attribute

[Christopher Bongaarts]

Is there a built-in way to do a regex or initial match against an 
attribute in a Predicate (in IdP 3.2.1)?

The supplied SimpleAttributePredicate works for exact matches, but I 
need a predicate that will return true if at least one value of an 
attribute starts with a particular letter...

Seems like it would be simple to code up a RegexAttributePredicate based 
on the Simple one, but I thought I'd ask first in case there's already a 
way to do this...

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