title: PHP's preg_match() returns only the match value
body: <p>I am doing the following:</p>
  <pre><code>$text = 'L\' utente _{nickname} ti ha invitato a giocare';
  
  $text_vars = preg_match('#\_{(.*?)\}#', $text, $matches);
  </code></pre>
  <p>returns:</p>
  <pre><code>Array
  (
      [0] =&gt; _{nickname}
      [1] =&gt; nickname
  )
  </code></pre>
  <p>How can it be made to only return the following?</p>
  <pre><code>Array
  (
      [0] =&gt; nickname
  )
  </code></pre>