package Cleaner;
sub new 
{
    my $class = shift;
    $class = ref($class) || $class;
    my $self = qr{^\s+|\s+$};
    return bless($self, $class);
}

sub clean 
{
    $_[1] =~ s/$_[0]//g;
}

package main;
$c = new Cleaner;
$foo = "\t\tFOO\t\t";
$c->clean($foo);
print $foo, "\n";