|Do you know where your variables are?|
Re^4: A regex that only matches at offset that are multiples of a given N?by BrowserUk (Pope)
|on Feb 16, 2013 at 00:29 UTC||Need Help??|
Update: with the hints about pos % 4 below, I've managed to get (?(cond)yes-expr|no-expr) to work. Not sure how well it goes performance-wise in practice,
Hm. I cannot make it work for my application; but on the basis of the failure I think my previous conclusion that putting code in regexes is always going to be dog slow:
I also can't get smls' version to work for this either?
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