# binary_multpile_of_4?(s) 
# that takes a string and returns true 
#if the string represents a binary number that is a multiple of 4. 
#NOTE: be sure it returns false if the string is not a valid binary number! 
def binary_multiple_of_4?(s)
   return true if s == "0"  
   s =~ /^[01]+00$/ 
end

Only works with ruby 2.2.2 for now.
Source is here : https://github.com/loureirorg/rb2exe
Also works with rails apparently.

I have not tested this gem. But it's worth mentioning it exists.
And yes... this is not a snippet