How get list of 'parameters' from string using regular expressions?
<p>I have the string with parameters like</p>

<blockquote>
  <p>"Hello, %{user}. Please, give %{client} a knife".</p>
</blockquote>

<p>So, please, I'm not familiar with regular expressions, and I need to have php construction which can get list of parameters from a string. Please, help me, I hope you can. Thank you. </p>
