title: PHP: preg_match - "Delimiter must not be alphanumeric or backslash"
body: <p>Does anyone know what is wrong with this regex? It works fine on sites like RegexPal and RegExr, but in PHP it gives me this warning and no results:</p>
  
  <pre><code>Warning: preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash
  </code></pre>
  
  <p>Here's my code:</p>
  
  <pre><code>preg_match('name="dsh" id="dsh" value="(.*?)"', 'name="dsh" id="dsh" value="123"', $matches);
  </code></pre>