title: MySQL - Preg Replace
body: <p>I have 2 column in table: C1, C2</p>
  
  <p>I want to update </p>
  
  <pre><code>C2 = Replace(C1, everything not a-zA-Z0-9\s(space), "")
  </code></pre>
  
  <p>but I can't find out how to do it :(</p>