Since I'm not much of an expert in genome problems (which is what you're working on, right?) I'm going to have to say that I need more information to understand where you're having difficulty. Could you show a few example rules that are giving you trouble in implementing? substr is a pretty useful tool for string manipulation that must occur in absolute positions. Some more complex manipulations based on in-string triggers may benefit from regexp implementations. But (I can't speak for everyone)... I need more info to know where the problem is. The case of converting the ninth character from the left of a string to upper case is probably not the problem you're having trouble solving, is it?

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