my ($old, $new, $reset) = map "\e[${_}m", 91, 92, 0;

... doesn't appear to be a common Perl trick ...

It's a very common (and very valuable) Perl "trick". See map and its cousin grep, and see List::Util for many useful functions inspired by the basic behavior of these two built-ins (i.e., iterate over a list and produce another list). As for other examples of the use of this type of function... well, keep your eyes open and I think you'll start to see quite a few, especially in code on this and similar websites. See also Map: The Basics in Tutorials.

Update: Per a /msg from hippo, double-quote "trick" to emphasize that it's not really a trick, but common usage. Also, another minor wording change for clarity.

Give a man a fish:  <%-{-{-{-<

In reply to Re^12: Immediately writing the results of search-and-replace by AnomalousMonk
in thread Immediately writing the results of search-and-replace by Anonymous Monk

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