I now have to get down to the business of understanding the regular expression.

There's not much to it really. Essentially the input file consists of 5 groups of non-whitespace characters interpersed with whitespace.

The only fly in that ointment is the 4th field which itself contains whitepace, and so prevents trival parsing with split. Luckily, as only one field contains multiple words, we can let the regex engine sort it out for us. Ask it for the first 3 whitespace delimited fields, and the last one. And the fourth field is everything left over.

You might find it clearer expanded out like this:

m[
    ( \S+ ) \s+
    ( \S+ ) \s+
    ( \S+ ) \s+
    ( .+  ) \s+
    ( \S+ ) $
]x
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