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  1. or download this
    >perl -wMstrict -le
"my $s = 'foo,,';
...
Use of uninitialized value $field3 in regexp compilation ...
Use of uninitialized value $field3 in concatenation (.) or string ...
bar matches ''
  2. or download this
    >perl -Mstrict -le
"my $s = 'foo,,';
...
field0 'foo'  field1 ''  field3 ''
bar matches ''
bar matches ''