s/& \(0\+255\)//;

##</code><code>##

my $have = q{clrf    __pbssCOMRAM& (0+255),c};
my $want = q{clrf    __pbssCOMRAM,c};

$have =~ s/& \(0\+255\)//;

print "$have\n$want\n";
print "They ", ($have eq $want ? '' : "don't "), "match\n";

##</code><code>##

s/\Q& (0+255)//;