If we've seen $chr once, can we somehow avoid repeating the assignment to $seen[ord($chr)] during the rest of the read?

Can we avoid even testing $seen[ord($chr)]?

I'd like to make a regex that matches any of our dwindling array of unseen characters, and update this regex every time I update $seen. Has anybody done this?

In reply to Re^2: Find what characters never appear by Narveson
in thread Find what characters never appear by Narveson

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