how to run regex calculation

Wesley Peng <[email protected]>
Newsgroups gmane.comp.apache.mod-perl
Message-ID <[email protected]> 
Hello

Give the case I have a string,

$str = "2 3 6";

I want to match with:

true if $str =~ /(\d+)\s(\d+)\s($1*$2)/;

that's to say, the thrid column would be (firstCol * SecondCol).

How to write regex for this?

Thank you.
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