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# have $1 contain everything but the leading "0:"
# and the trailing ",$intOrFloat" ... in this case ",4.00"
...

$_  = "0:20,1.00,g,1.00;65,4.00,g,4.00";
/0:(.)+,$intOrFloat/ and warn $1;

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# $1 contains a series of triplets separated by semicolons
# Each triplet consists of price,quantity,unit_of_measure
# The goal is to create an array of hashrefs with this data:
# { price => ..., quantity => ..., unit_of_measure => ... }