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Perl things I always forget

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This idiom, I love it so much but I use it fairly infrequently, but it’s absolutely gorgeous

# Assign to another variable the result of a RegEx
($new= $old) =~ s|foo|bar|g;

And this one I just forget, because I tend to use hashes

```perl

Remove element from an array based on index:

splice(@array, 3, 1);