正则表达式1

 1 import java.util.regex.Matcher;
 2 import java.util.regex.Pattern;
 3 
 4 public class RegexDemo {
 5 
 6     public static void main(String[] args) {
 7         method_5();
 8     }
 9 
10     /*
11      * 需求：定义一个功能对QQ号进行校验。 要求：长度5~15. 只能是数字， 0不能开头
12      */
13     public static void method_1() {
14         String qq = "101885";
15         String regex = "[1-9]\\d{4,14}";
16         System.out.println(qq + ":" + qq.matches(regex));
17     }
18 
19     /*
20      * 需求：手机号码验证
21      */
22     public static void method_2() {
23         String tel = "18190029004";
24         String regex = "1[358]\\d{9}";
25         System.out.println(tel + ":" + tel.matches(regex));
26     }
27 
28     /*
29      * 需求：叠词切割
30      */
31     public static void method_3() {
32         String str = "akjdhkahjjauuuuqjhadwww;k";
33         String regex = "(.)\\1+";
34         String[] arr = str.split(regex);
35         for (String s : arr) {
36             System.out.println(s);
37         }
38     }
39 
40     /*
41      * 需求：替换 1.手机号部分替换 2.叠词替换
42      */
43     public static void method_4() {
44         String tel = "13840056789";
45         String regex = "(\\d{3})(\\d{4})(\\d{4})";
46         System.out.println(tel.replaceAll(regex, "$1****$3"));
47 
48         String str = "akjdhkahjjauuuuqjhadwww;k";
49         String reg = "(.)\\1+";
50         System.out.println(str.replaceAll(reg, "*"));
51     }
52 
53     /*
54      * 需求：获取 三个字母的单词
55      */
56     public static void method_5() {
57         String str = "ajkdh iqw iqiw qii,wip aido q qw";
58         String regex = "\\b[a-z]{3}\\b";
59         Pattern p = Pattern.compile(regex);
60         Matcher m = p.matcher(str);
61         while (m.find()) {
62             System.out.println(m.group());
63             System.out.println(m.start() + " " + m.end());
64         }
65     }
66 }