I'm not sure just who you're replying to, but in general ...

... how "tr" counts the remaining slashes ...

Please see discussion of  tr/// operator in Quote-Like Operators section of perlop. In particular, please see examples 2-4 in Examples sub-section.

... how the printf is being used.

Please see printf; see sprintf for discussion of format specifiers.

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: Most efficient way to remove some text from a string by AnomalousMonk
in thread Most efficient way to remove some text from a string by adamZ88

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