I wouldn't have let tr delete anything - just count the number of ones and then test that number for oddness. So I'd say this as $is_odd = $foo =~ tr/1// & 1; $is_even = $foo =~ tr/1// ^ 1;. This only tests bit zero's value and in theory is speedy. I dunno if it actually is.

In reply to Re: Re: Number of bits, length of RegExp by diotalevi
in thread Number of bits, length of RegExp by YAFZ

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