Frequently I find that I want to create a variable that resembles a currently existing variable but with a substitution applied. Invariably, this is the way I do it: 
$ExistingVariable = "SuperMan";
$NewVariable = $ExistingVariable;
$NewVariable=~s/^Super//;

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Is there a way to say something like $NewVariable eq whatever $ExistingVariable would be if I applied s/^Super// to it? Does that make sense? Does this have to take up three lines or can I do it in one?

In reply to Substitution question by Anonymous Monk

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