Both conditions need to be in one set of parentheses e.g

if($condition ne 'SN' && $condition ne 'SU') {
    ...
}
# of if you like your regexes
if($condition !~ /^S[UN]$/) {
    ...
}
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For more info on perl's syntax check out the perlsyn manpage.
HTH

_________
broquaint