title: How do I build an ICU regex to match this kind of string?
body: <p>Hi I need an ICU regex that I think it is pretty basic but I don't know how to build it right. The regex should match strings like:</p>
  
  <pre><code>font-size: 9pt;
  font-size: 15pt;
  font-size:2pt;
  font-size:22pt;
  </code></pre>
  
  <p>I'm trying to make something like this but it doesn't work:</p>
  
  <pre><code>regex = \bfont\-size: [0-9]{3}pt;\b
  </code></pre>
  
  <p>I'm really new to regex so I'm not sure what am I doing wrong here. Any help is much appreciated. </p>
  
  <p>P.S.: Does anyone know a good resource to get the hang of this fast?</p>