[R] perl expression question

[markleeds]

If I have the string below. does someone know a regular expression to 
just get the "BLC.NYSE". I bought the O'Reilley
book and read it when I can  and I study the solutions on the list but 
I'm still not self sufficient with these things. Thanks.

stock<-"/opt/limsrv/mark/research/equity/projects/testDL/stock_data/fhdb/US/BLC.NYSE"

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