title: Currency / Percent Regular Expression
body: <p>I have to match values like </p>
  
  <pre><code>€ 6.483,00
  </code></pre>
  
  <p>OR values like</p>
  
  <pre><code>18,50%  
  </code></pre>
  
  <p>OR, again, </p>
  
  <pre><code>+65,86 %
  </code></pre>
  
  <p>in a Javascript function, which I drafted as:</p>
  
  <pre><code>function(s) {
    return /^[0-9]?[0-9,\.]*$/.test(s);
  }
  </code></pre>
  
  <p>but, obviously, it's not working... how should it be changed?</p>