$intOrFloat = qr/^[+-]?\ *(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?$/;

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metaperl:
Also note that the definition of  $intOrFloat given in the OP requires that the integer or float be the only thing in the string (i.e., it must start at the start  ^ and end at the  $ end), and the example string given in the OP
    $_  = "0:20,1.00,g,1.00;65,4.00,g,4.00";
and the pattern used to match it
    /0:(.)+,$intOrFloat/
both have other stuff at the start.

Update: metaperl: Good luck with your homework assignment.

In reply to Re^2: Match integer or floating point numbers, then parse triplets by AnomalousMonk
in thread Match integer or floating point numbers, then parse triplets by metaperl

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