title: Python Regex - Find numbers with comma in string
body: <p>I might have a string:</p>
  
  <pre><code>"Foo Bar, FooTown, $100,00" 
  </code></pre>
  
  <p>Now I need to split that string by a comma, but that would split it wrongly, as the <code>$100,00</code> contains a comma too. </p>
  
  <p>So I first want to look in the string, are there any numbers with a comma, and if so, replace the comma with a fullstop. so it looks like:</p>
  
  <pre><code>"Foo Bar, FooTown, $100.00"
  </code></pre>
  
  <h3>EDIT:</h3>
  
  <p>It will always be small numbers, there won't be more than one <code>,</code> or <code>.</code>, but it might be $1 $10 $100 $1000</p>
  
  <p>The string might or might not have spaces before the <code>,</code></p>
  
  <p>This is a SMS message.</p>