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   | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>remplacer un nombre aléatoire de virgules dans un chaîne.</title>
  <meta http-equiv="Content-type" content="text/html; charset=UTF-8" />
  <style type="text/css">
  * {margin:0;padding:0;}
  body {margin:10px;background:#000;color:#ddd;font-size:1em;font-family:Helvetica, Arial, sans-serif;}
  div {width:10em;height:3em;background:#333;}
  </style>
</head>
<body>
  <script type="text/javascript">
  <!--
    var s1 = ",,1,2,7,,8,12,9,,";
    var re1 = /,{2,}/g;
    var re2 = /^,/g;
    var re3 = /,$/g;
    var s2 = s1.replace(re1, ",");
    s2 = s2.replace(re2, "");
    s2 = s2.replace(re3, "");
    alert(s2);
  //-->
  </script>
</body>
</html> | 
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