Of course TMTOWTDI, but using tr/// will probably be the fastest.
$_ = "a b\tc\nd";
y/ \t\n/_/s;
print; # prints "a_b_c_d"
--
Fletch | "If you find my answers frightening, __`'/|
fletch at phydeaux.org | Vincent, you should cease askin' \ o.O'
| scary questions." -- Jules =(___)=
| U