It is a good idea but it won't work the way you have it. The problem is that with limit parameter, the last element contains the rest of the string. If there are more than four data fields, then the fourth element will contain all of them. Also, the parenthesis around the split are needed to force it into list context. Instead, this will work:

my $start = (split(/s\+/, $data[145], 5))[4];
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