Select Code to Download

use 5.18.2;
use Text::CSV; 
...
__DATA__
(101, '1997-02-25', 'S1', 31.00, NULL, 0.00, 'this becomes two fields,
+ so no go', 5.11),
(102, '1998-03-26', 'S1', 31.00, NULL, 0.00, 'this will remain one fie
+ld', 6.11),

perl test.pl
[   '(101',
...
    'this will remain one field',
    '6.11),'
    ]

use Text::CSV qw( csv ); 
use Data::Peek;
...
    on_in => sub { $_[1][0] =~ s/^\(//; $_[1][-1] =~ s/\),?\s*$//; });

DDumper $aoa;

[
    [   101,
...
        '6.11'
        ]
    ]