Need assembler trick to quickly get second and third DS qualifiers

[Pinnacle]

I have a dataset FIRST.SECOND.THIRD, and I want to get SECOND.THIRD.  
Normally I would loop to one character at a time to get to the '.', but 
I need performance here.  I sure some of you assembler gurus could give 
me some inscrutable assembler to get there in like one or two 
instructions.  Thanks in advance!

Regards,
Tom Conley
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