Re^7: Faster regex to split a string into runs of similar characters?

For your data, using a null byte instead of a space would be importeant.

Actually that's why I chose /.\0*/gs instead of /[^\0]\0*/s. This means that the first character can be a 0, and every iteration after that it will never start with null because of the way regex work. Or technically, the idea crossed my mind, I realized it would still work by chance, and then forgot to mention it :)

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Re^8: Faster regex to split a string into runs of similar characters?
by BrowserUk (Patriarch) on Nov 22, 2016 at 16:34 UTC

Or technically, the idea crossed my mind, I realized it would still work by chance, and then forgot to mention it :)

The significance went right over my head.

But, I'm really impressed that vr picked up on it. It is so nice to see an OP applying their own thought processes to the posted code, rather than using it verbatim and then blaming us for not having considered every last nuance and detail of their problem, if it goes wrong.

I really like your offset-and-xor technique. It is similar to a process I've used for edge detection in images in the past.

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