title: Matching a hash character (#) with a regex
body: <p>I have an XML document that contains a regular expression (so you don't need to escape with \). Basically I'm trying to match musical chord symbols, and this regex works fine, but refuses to match a hash:</p>
  
  <pre><code>\b[A-G](m|b|\#|sus|\d)*?\b
  </code></pre>