title: C++ regex for string "M0.89"
body: <p>Trying to represent the following in a C++ regex: M0.89 or m1.78 or M0.9</p>
  
  <pre><code>"M|m([0-9].[0-9]+)"
  </code></pre>
  
  <p>Regex checking programs show that it is not working. What am I doing wrong?</p>
  
  <p>Thank you!</p>