Harry Fuecks brings the next part of his "Joy of Regular Expressions" series to the SitePoint PHP Blog today with part four, building on the previous how-tos: part one, part two, and part three.

He looks at a few different topics this time - date checking, making dates more user-friendly, exploding with patterns, and capturing split delimiters. Just like in the previous articles in the series, he explains in what kind of situation the expression would be used and the sample code showing how to use it (oh, and the output too).