一，效果图。
二，代码。
- <!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>
参考资料：《菜鸟教程》
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