09-15-2017
map is confusing because it's actually a kind of loop. $1 is the bracketed part of /(.*)\// in this context.
The whole thing means, "For each item in @ARGV[N], do { /(.*)\//; output[N]=$1 }"
Then the whole thing is crammed into a "join" which returns them tab-separated.
I have no idea why it removes the ".trim", the .*\/ is a regex meaning "several of any character, followed by a forward slash". It just stops at the last forward slash in the string ( not the first, because of greedy matching. )
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