Generate a random string (extracted from WEBrick)

random_string.rb

# extracted from the WEBrick::Utils module

RAND_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz"

def random_string(len)
  rand_max = RAND_CHARS.bytesize
  ret = ""
  len.times{ ret << RAND_CHARS[rand(rand_max)] }
  ret
end

# random_string 10
#=> "Cty07iLWY9"