正则表达式二、

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三、返回值
exec()
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
window.onload=function() {
var str = 'you are a boy';
var reg = new RegExp('o', 'g');
//匹配正则返回一个数组
// alert(reg.exec(str));
//lastIndex是搜索的字符下标起始位置
reg.lastIndex=3; //起始位置,从第四位开始匹配
console.log(reg.exec(str)); //复杂的在控制台打印(下标1)
console.log(reg.exec(str)); //再次调用(下标11)
console.log(reg.exec(str));
console.log(reg.exec(str));
}
</script>
</head>
<body>

</body>
</html>
match()
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
var str = 'hello world O';
var reg=/o/ig;
//字符串匹配正则表达式,返回的是匹配到的结果数组
console.log(str.match(reg))
</script>
</head>
<body>

</body>
</html>
search()
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
var str = 'hello world O';
var reg=/l/;
//索引与正则表达式相匹配的值,返回的是匹配值的索引
console.log(str.search(reg))
</script>
</head>
<body>

</body>
</html>
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