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Darn, you are right. I hate it when you do that to me. ;-)

The regexp can be repaired perhaps: (var ~ /^-*[0-9.]*[0-9]+$/).

Testing for [[:alpha:]] alone will also not do the trick because of...

Well done, but this:


Is perhaps a typo. Shouldn't it read:


a=check($2);
b=check($4);

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