Workaround for horrendously slow SUBSTR Character Parsing in FoxPro

FoxPro's string speed is reasonably good for most operations. But one shortcoming is character by character parsing which can only be accomplished via the `SUBSTR()` command, which as it turns out is horribly slow when strings get large. In this post I describe the problem and offer a couple of solutions to get better character by character parsing speed for string iteration.

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