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I'd like to work on a BB Code filter for a PHP website. (I'm using CakePHP, it would be a BB Code helper). I have the following requirements: BB Code can be nested. So something like this is valid [block] [block] [/block] [block] [block] [/block] [/block] [/block] Bbcodes can have 0 or more parameters. Example: [video: url="url", width="500", height="500"]Title[/video] BB Code might have multiple behaviours Let's say [url]text[/url] would be transformed to [url:url="text"]text[/url] or the video BB Code would be able to choose between YouTube, Dailymotion, etc. I've already done something with regex, but my biggest problem was matching parameters. In fact, I got nested BB Code and BB Code with 0 parameters to work. But when I added a regex match for parameters, it didn't match nested BB Code correctly: "\[($tag)(=.*)\"\](.*)\[\/\1\]" (It wasn't .* but the non-greedy matcher) I don't have the complete regex with me right now, But I had something that looked like that(above). Is there a way to match BB Code with regex or something else? The only thing I can think of is to use the visitor pattern and to split my text with each possible tags. This way, I can have a bit more of control over my text parsing and I could probably validate my document so if the input text doesn't have valid BB Code... I could notify the user with a error before saving anything. I would use SableCC to create my text parser.

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