I think I like LanX's grep/unpack approach best

May I ask why? When I benchmarked it, rjt's regex was 5-10 times faster (depending on grid size) than the grep/unpack approach when used alone, and even faster when I combine it with our existing expression. Efficiency was a main requirement, and I personally don't find the grep/unpack any more readable or maintainable than the regex, but maybe that's just me.

(LanX, please don't feel like I'm picking on you. I really appreciate your comments and learned from them. It's just that for what I asked for help with, I thought rjt's solution was way better, but now I'm trying to understand why it might not be.)

In reply to Re^2: Regex matching on grid alignment by Anonymous Monk
in thread Regex matching on grid alignment by Anonymous Monk

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