c:\@Work\Perl\monks>perl -wMstrict -le
"$_ = 'x=x,?x';
 print qq{'$_'};
 ;;
 $_= ~/^\w+\s*=\s*\w+\s*\,\?\w+/ ;
 print qq{'$_'};
 ;;
 $_ = '----';
 print qq{'$_'};
 ;;
 $_= ~/^\w+\s*=\s*\w+\s*\,\?\w+/ ;
 print qq{'$_'};
"
'x=x,?x'
'4294967294'
'----'
'4294967295'