Some text matching questions

[Vendettta]

Thanks to everyone for the detailed explanations. Much appreciated. Having it explained in actual language helps, and I'm slowly getting it.

Something finally dawned on me. The filter completes its check, (meaning goes through the entire filter) 7 characters after a match, then begins again with the next character it encounters. I understood it when I read "...we have Proxo check its memory." That can't occur until the latter part of the filter expression. For some reason I was thinking of it checking the entire page while still within the initial iteration of the filter. Yes, stupid I know.

I'll just accept that PrxNeverMatch does what it does. Doubtful I'd know how to apply it in a non-similar instance though.