JavaScript正则表达式exec()方法详解

语法格式

RegExpObject.exec( string );

<html>
<head>
<title>JavaScript RegExp exec Method</title>
</head>
<body>
<script type="text/javascript">
  var str = "Javascript is an interesting scripting language";
  var re = new RegExp( "script", "g" );

  var result = re.exec(str);
  document.write("Test 1 - returned value : " + result); 

  re = new RegExp( "pushing", "g" );
  var result = re.exec(str);
  document.write("<br />Test 2 - returned value : " + result); 
</script>
</body>
</html>

Test 1 - returned value : script
Test 2 - returned value : null