You should quote the parts of the replacement you don't want executed: 

    s/WORD\s(\d+)/"WORD ".(2*$1)/e;

[download]

Or, how I'd write it: 

    s/(WORD\s)(\d+)/$1.(2*$2)/e;

[download]
        - tye (but my friends call me "Tye")

In reply to RE: Re: regex and multiplication by tye
in thread regex and multiplication by elwarren

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