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perl -le '$_="2|3|||||"; @a = split /\|/; print scalar @a
2

     split   Splits a string into a list of strings and returns
             that list.  By default, empty leading fields are
             preserved, and empty trailing ones are deleted.

perl -le '$_="2|3|||||"; @a = split /\|/, $_, 7; print scalar @a'
7