The standard method for calculating words for the purpose of finding WPM is counting all the characters and dividing by six. Why six? Because the average word is 5 characters long, plus a space.
I'm really no good at one-liners or golfing, but I quickly modified your code. It obtains the accuracy you're looking for. Tested on ActivePerl Build 629 (Perl v5.6.1).
If Bill Gates can name a company after his "bedroom" problems, I can have a stupid sig that points it out.
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