calculator.jl

function evaluate(evalString)
  m = match(r"(.*?)\((.*)\)(.*)", evalString)
  if m != nothing
    evalString = "$(m.captures[1])$(evaluate(m.captures[2]))$(m.captures[3])"
  end

  # Brackets are dealt with
  # Add
  m = match(r"(.*)\+(.*)", evalString)
  if m != nothing
    evalString = "$(evaluate(m.captures[1]) + evaluate(m.captures[2]))"
  end

  # Subtract
  m = match(r"(.*)\-(.*)", evalString)
  if m != nothing
    evalString = "$(evaluate(m.captures[1]) - evaluate(m.captures[2]))"
  end

  # Multiply
  m = match(r"(.*)\*(.*)", evalString)
  if m != nothing
    evalString = "$(evaluate(m.captures[1]) * evaluate(m.captures[2]))"
  end

  # Divide
  m = match(r"(.*)\/(.*)", evalString)
  if m != nothing
    evalString = "$(evaluate(m.captures[1]) / evaluate(m.captures[2]))"
  end

  parse(Float64, evalString)
end

s = "2 * (4+(3 / 6 + 4 * 6)) + 6"
println(evaluate(s))