What the...
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A possible regexp to format text surrounded by asterixs or underscores
into bold and italic web markup.

 $html =~ s,(\s[\>\<\_\']*)\*([\>\<\_\']*[^\s][\>\<\_\']*.*?[\>\<\_\']*[\>\<\_\']*)\*([\>\<\_\']*[\,]?\s),$1<b>$2</b>$3,gs;
 $html =~ s,(\s[\>\<\*\']*)\_([\>\<\*\']*[^\s][\>\<\*\']*.*?[\>\<\*\']*[\>\<\*\']*)\_([\>\<\*\']*[\,]?\s),$1<i>$2</i>$3,gs;