Hi desertrat,
before I spend time on working out how to do it, I'd rather spend a few minutes persuading you that it's not a good idea. I know, oftentimes it's come corporate-level decision that you just have to implement, but if you have any say in it: don't. It's fine to require some classes of characters to keep people from using all too simple variations of distionary words, but
- four is excessive, i.e. it already limits the number of allowable passwords too much, and
- imposing rules on supposedly "random" distribution limits them even more, making brute-force cracking actually easier.
I'd suggest using
Crypt::Cracklib or somesuch password checker on generated results and retrying if it finds the result all too easily crackable.
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