* $ ^From:.*\/[^$WS].*
I prefer to match on know characters when possible than just
wildcarding for any old thing.
And that is what that does.
1. The match operator \/ is first greedy-to-the-left, then
2. The .* at the left of the match operator is non-greedy, because of
the match operator.
This all simply means that the .* in the middle is first tried with
length 0, then with length 1, etc.
(The behaviour of the .* at the end is greedy, because it is at the
right side of the match operator.)
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