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 }