password_check_reg_exp.rb

def passwordCheckRegExp(inputString)
    capital = false
    small = false
    digits = false
    characters = false

    x = 0

    if inputString.length >= 5 then
       characters = true
    end

    while (x < inputString.length)
          if inputString[x] >= 'A' and inputString[x] <= 'Z' then
             capital = true
          end

          x = x + 1
    end

    x = 0

    while (x < inputString.length)
          if inputString[x] >= 'a' and inputString[x] <= 'z' then
             small = true
          end

          x = x + 1
    end

    x = 0

    while (x <inputString.length)
          if inputString[x] >= '0' and inputString[x] <= '9' then
             digits = true
          end

          x = x + 1
    end

    if characters == true and capital == true and small == true and
       digits == true then
       return true
    else
       return false
    end
end