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Very nice commented examples that show exactly what each part of the wacky regex syntax does.

First class layout for explanation with Test Cases: what more could you ask for.

Although it falls in the trap to use (too simple) regexes where it shouldn't (not handling admittedly corner cases), the article is indeed good in breaking down the concrete regular expressions into edible parts.

Too many well-done regexes for cases that shouldn't be using regexes.