title: split and extract Operator from Operand with Regex
body: <p>I have an Equation that includes Operator and Operand.
  I want to split it and extract the Operator and Operand in one String array like this:</p>
  
  <pre><code>4+3 -2 + 1* 5 -2
  
  4,+,-,2,+,1,*,5,-,2
  </code></pre>
  
  <p>Does anyone have a suggested Regex pattern for this?</p>