title: Extracting number from string in Python with regex
body: <p>I want to extract and print a variable number '-34.99' from the string:</p>
  
  <pre><code>myString = "Test1 [cm]:     -35.00/-34.99/-34.00/0.09"
  </code></pre>
  
  <p>The values in the string will change.
  How can I do it with the regular expression in Python?</p>
  
  <p>Thanks in advance</p>