I have strings of the form TICKER.GGG.XXXXXX.dat
but GGG is not always three characters so I can't use substr to pull it out of the string.
Could someone tell me how to use sub to pull out the GGG but more generally the string between the dot after the R in TICKER and the next dot. I still don't have a very good understanding of regular expressions but I'm trying to get that slowly. thanks.
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