I'm interested to know if there's a "simpler" way to do this - ideally getting rid of the super-hideous while loop
How about a recursive solution?
my($num) = @_;
return $num if length($num)<4;
return commify(substr($num,0,-3), $len).",".substr($num,-3,3);
...no super-hideous while loop
there, and no regex compilation either. ;-)
The only downside is that this only works for integers.
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