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how can adding 2 numbers, converting it to a string, then pattern matching it to "2" do anything useful? string.match returns either a substring or nil. So, you'll get something non-nil if the result of the addition contains the digit 2 in decimal. That's certainly not what was requested? 

e.g. take 10000 and 00100, no matching bits but

16 + 4 = 20, which contains "2"
without bit-wise operators in lua (e.g. XOR), you're going to need to go through the digits one at a time I'm afraid... 




Merick wrote:

Shmuel Zeigerman wrote:

Merick wrote:
I was wondering if there was any way - other than using a for loop to iterate through each character - to use the string library to compare two strings with representations of binary numbers and tell whether or not any of the 1's in the strings are in the same position?
Something like compare("11100", "00011") would return false and compare("11100","00111") would return true 



function compare(a,b)
  a = tostring(tonumber(a) + tonumber(b))
  return a:match"2"
end


Dangit, that's so simple I can't believe I didn't think of it myself!

Thanks


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