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$a = "aaaaa\n";
$a = $a."bbbbb";
...

what it actually runs is 
insert into test (field1) value 'aaaaa

$sql="insert into test (field1) value 'aaaaaaa' + Chr(13) + Chr(10) + 
+'bbbbbbbb';

$a =~ s/chr(13)chr(10)/' + Chr(13) + Chr(10) + '/;