c:\@Work\Perl\monks>perl -wMstrict -le
"my $s = '.net,.Net; .NET;.net, .NET  x.NET .NETx x.NET; x.NET,';
 ;;
 for my $kw (qw(.NET C C++)) {
   my $count = () = $s =~ m{ (?: (?<! \S) | (?<= [,;])) \Q$kw\E (?: (?! \S) | (?= [,;])) }xmsig;
   print qq{'$kw' $count};
   }
"
'.NET' 5
'C' 0
'C++' 0