正则表达式工具：
在线正则表达式测试https://tool.oschina.net/regex/
身份证正则表达式：[12344568]\d{16}[0-9xX]
1.正则表达式介绍
2.正则表达式字符
3.元字符
h[ae]llo 057[0-9] [ABCD]
4.多次重复
\d{6}
\d{3,4}-\d{7,8}
[A-Z][a-z]+ [A-Z][a-z]* | [A-Z][a-z]+\s[A-Z][a-z]*
5.定位匹配、贪婪模式（默认）、非贪婪模式
6.表达式分组
(\d{4})||(\d{6})
^([\u4e00-\u9fa5][A-Z])-([0-9A-Z]{5})$
^([\u4e00-\u9fa5]{2,8})|([A-Z][a-z]+\s[A-Z][a-z]*)
7.JavaScript表单验证
1 <!DOCTYPE html>
2 <html>
3 <head>
4 <meta charset="UTF-8">
5 <title>Insert title here</title>
6 </head>
7 <body>
8 <form action="#" method="post" id="frmInfo">
9 <div id="err" style="color:red">
10
11 </div>
12 <div>
13 姓名:<input id="name" name="name"/>
14 </div>
15 <div>
16 身份证:<input id="idno" name="idno"/>
17 </div>
18 <div>
19 <input type="submit" />
20 </div>
21 </form>
22 <script type="text/javascript" src="js/jquery-3.4.1.js"></script>
23 <script type="text/javascript">
24 $("#frmInfo").submit(function(){
25 //在JS中定义正则表达式对象只需要在/正则表达式/
26 var regex1=/^[\u4e00-\u9fa5]{2,8}$/;
27 var regex2=/^[1234568]\d{16}[0-9Xx]$/
28 var name=$("#name").val();
29 var idno=$("#idno").val();
30 if(regex1.test(name)==false){//利用正则校验数据
31 $("#err").text("无效姓名");
32 return false;
33 }else if(regex2.test(idno)==false){
34 $("#err").text("无效身份证");
35 return false;
36 }
37 else{
38 alert("验证通过，准备提交");
39 return true
40 }
41
42 })
43
44 </script>
45 </body>
46 </html>
8.Java中Web页面信息提取
1 package regex;
2
3 import java.io.BufferedReader;
4 import java.io.FileInputStream;
5 import java.io.FileNotFoundException;
6 import java.io.InputStreamReader;
7 import java.util.regex.Matcher;
8 import java.util.regex.Pattern;
9
10 public class RegexSample {
11 public static void main(String[] args) {
12 StringBuilder content = new StringBuilder();
13 try {
14 FileInputStream fis = new FileInputStream("F:/workspace/regex/WebContent/sample.html");
15 InputStreamReader isr = new InputStreamReader(fis,"UTF-8");
16 BufferedReader bufferedReader = new BufferedReader(isr);
17
18 String lineText = "";
19 while((lineText = bufferedReader.readLine()) != null) {
20 // System.out.println(lineText);
21 content.append(lineText + "\n");
22 }
23 bufferedReader.close();
24 System.out.println(content);
25
26 } catch (Exception e) {
27 // TODO Auto-generated catch block
28 e.printStackTrace();
29 }
30
31 //1.创建正则表达式对象
32 Pattern p = Pattern.compile("<li>([\\u4e00-\\u9fa5]{2,10})([a-zA-Z]+)</li>");
33 //2.匹配正则表达式
34 Matcher m = p.matcher(content);
35 //3.查找匹配的结果
36 while(m.find()) {
37 // System.out.println(m.group(0));
38 String chs = m.group(1);
39 String eng = m.group(2);
40 System.out.println(chs + "-" + eng);
41 }
42 }
43 }