Alright, this is definitely silly, and nobody would do this but... you just wanted some ideas

$s = "a=1, b=2, c=3";
$s =~ s/a=(\d+), b=(\d+), c=(\d+)/a=$2, b=$3, c=$1/;
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and then there is this, which uses the hash the same way as the array example you gave... but it's with a hash so it's different hehe :)

@n{a, b, c} = (1, 2, 3);
@n{a, b, c} = @n{b, c, a};
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hrmm... I had another example... but I'll quit while I'm ahead and don't have people questioning my sanity.