x
 
<!DOCTYPE html>
<html>
<body>
<p>单击按钮以全局搜索“l”,后跟零个或多个“o”字符。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
  var str = "Hellooo World! Hello W3School!"; 
  var patt1 = /lo*/g;
  var result = str.match(patt1);
  document.getElementById("demo").innerHTML = result;
}
</script>
</body>
</html>