title: RegEx for all letters (including Chinese, Greek, etc.)
body: <p>I need a regex that also matches Chinese, Greek, Russian, ... letters. 
  What I basically want to do is remove punctuation and numbers. </p>
  
  <p>Until now I removed punctuation and numbers "manually" but that does not seem to be very consistent. </p>
  
  <p>Another thing I have tried is</p>
  
  <pre><code>/[\p{L}]/
  </code></pre>
  
  <p>but that is not supported by Mozilla (I use this in a Firefox extension). </p>