First question is: what books are you reading?
I have a CS degree so I have read the basic texts on Algorithms, Operating Systems, Compilers. I recently got through the Design Patterns book. I was thinking of picking up either a new language (Go) or start the "Mastering Regular Expressions" book, not sure which.
I think that, in most cases, regular expressions will do you more good as a tool than Go will. I have not read Mastering Regular Expressions, but due to their ubiquity, they have probably led to a 5% increase in my productivity as a software engineer. I highly doubt that Go will do that for you except in some very rare cases.