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[May 2012 note: Well huh. Doesn't seem to work anymore. I wrote this long, long ago, when Java first came out. The source code is nowhere to be found. So you can run the app and delight in how amusingly it fails, or just read the exciting explanatory text. Or not.]

• Red letter(s) in the regular expression show what part(s) of the pattern will test the next character in the input string. Red letter in the input string shows which character is about to be tested. Tell me more.
• There are six special characters: +*?|(). What do they do?
• So what matched?
• Is this an NFA or a DFA?

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