Fourty-two chars. One regex. I'm stunned. 
pop=~/^((.)(??{"\Q$2"x$-[1]})(?!\2)){3,}$/

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   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to (MeowChow - holy $#!@) Re: (Golf) Fibonacci Strings by MeowChow
in thread (Golf) Fibonacci Strings by danger

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