TIMTOWTDI :)

I've always been fond of this, which also compresses "extra" spaces in the middle to a single space:

$name = join ' ', split ' ', $name;
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It's not all that much slower than the others, and if you want to compress the internal whitespace it's hard to beat. Lots of my proggies have a little sub:

sub wsp {
   $_ = shift;
   join ' ', split;
}
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which takes advantage (in terseness, not speed) of the magic of $_ and split's default behavior.