split /[[]\s:()]+/,$line>

Have you tried to use the quoted code? What happens if you do? (I'm not sure what the  '>' on the end of this code fragment is supposed to be.)

I'm not familiar with your data, but I think I would try (untested)
    split /[\[\]\s:()]+/, $line
instead. Be aware that this may generate an extraneous empty string at the beginning of the split output list, so your selection indices may need adjustment.