s/\b([aeiou])(\w*)/$1$2way/g;
s/\b([^aeiou .]+)([aeiou]\w*)/$2$1ay/g;

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This one handles spaces and periods, using greediness and word anchors to do the trick. It helps to handle rule b) first, when using two regexes.

In reply to Re: Pig Latin by chromatic
in thread Pig Latin by vroom

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