> Parsing tab-, comma-, whatever-separated files has various issues that have already been dealt with by Text::CSV

Like what?

That module deals with all the features and intricacies of the 'official' CSV format, such as quoting/escaping and embedding newlines/NULLbytes. But the OP never specified the input data be in that complex format; from the looks of it it's just simple ASCII strings delimited by tabs and newlines. No need to take a sledgehammer to crack a nut...

> This is probably not a wheel you need to reinvent

Applying a simple, tried-and-true Perl idiom is not much of an 'invention':

while(<>) { my @fields = split /\t/; ... }

In reply to Re^2: Count number of elements in HoH and sum them for other keys (sledgehammer) by Anonymous Monk
in thread Count number of elements in HoH and sum them for other keys by Sosi

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