<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <title>JavaScript 正则表达式</title>

</head>

<body>

    <!--search方法使用正则表达式-->

    <p>搜索字符串"w3cSchool",并显示匹配的起始位置</p>

    <button onclick="myFunction()">点我</button>

    <p id="demo"></p>

    <script>

    function myFunction() {

        var str = "Visit W3cSchool!";

        var n = str.search(/w3cSchool/i);

        document.getElementById("demo").innerHTML = n;

    }

    </script>

    <!--search方法使用字符串-->

    <p>搜索字符串 "W3cSchool", 并显示匹配的起始位置：</p>

    <button onclick="myFunction()">点我</button>

    <p id="demo1"></p>

    <script>

    function myFunction() {

        var str = "Visit W3cSchool!";

        var n = str.search("W3cSchool");

        document.getElementById("demo1").innerHTML = n;

    }

    </script>

    <!--replace方法使用正则表达式-->

    <p>替换"microsoft"为"w3cschool</p>

    <button onclick="myFunction()">点我</button>

    <p id="demo3">Please visit microsoft</p>

    <script>

    function myFunction() {

        var str = document.getElementById("demo3").innerHTML;

        var txt = str.replace(/microsoft/i, "w3cshool");

        document.getElementById("demo3").innerHTML = txt;

    }

    </script>

    <!--replace方法使用字符串-->

    <p>替换"microsoft"为"w3cschool"</p>

    <button onclick="myFunction()">点我</button>

    <p id="demo4">please visit microsoft</p>

    <script>

    function myFunction() {

        var str = document.getElementById("demo4").innerHTML;

        var txt = str.replace(/microsoft/i, "w3cschool");

        document.getElementById("demo4").innerHTML = txt;

    }

    </script>

    <!--使用 test()-->

    <script>

    var patt1 = new RegExp("e");

    document.write(patt1.test("The best things in life are free"));

    </script>

    <!--使用 exec()-->

    <script>

    var patt1 = new RegExp("e");

    document.write(patt1.exec("the best things in life are free"));

    </script>

</body>

</html>