In the scope/context provided, it doesn't make sense to use regex to achieve "Hello zy". If it's always going to be "Hello " followed by index 2 and index 1 of @a array, then just make it:
my $s = 'Hello ' . $a[2] . $a[1];
which can be easily parametarised in that format. Or even use splice. why the regex?
the hardest line to type correctly is: stty erase ^H
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