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my $sep = q/' '/;
$sep = shift @ARGV if @ARGV; # you get the idea
my $line = "   one two three   \n";
my @words = eval qq(split $sep, \$line);

$sep = q(/\s+/);
$sep = q(//);
$sep = q(/two|\s+/);
$sep = q(m|/|);