JavaScript: RegExp + replace

We can use RegExp + replace to change Specific text into others we want.

This picture shows the result after we exchange:

Below is this project's code:

 1 <!DOCTYPE html>
 2 <html>
 3 <head lang="en">
 4   <meta charset="UTF-8">
 5   <title>RegExp</title>
 6 </head>
 7 <script>
 8     function strreplace(){
 9         var str=document.getElementById("str").value;
10         var newstr=str.replace(/paul/g,"Ringo");
11         document.getElementById("demo").innerHTML = newstr;
12     }
13 </script>
14 <body>
15     请输入一串带有“paul”(小写)的单词串，不同单词用<br>空格隔开，点击“替换”，可将“paul”替换成“Ringo”.
16     <br><br><br>你可以复制这段字符进下框测试：paul like Spaul Paul paul
17     <br><br>会发现所有的“paul”都被替换成“Ringo”。
18     <br><br><br><input type="text" name="str" id="str">
19     <input type="button" value="替换" onclick="strreplace()">
20     <br><br>替换后：<p id="demo"></p>
21 </body>
22 </html>