From 5303486ff5506b18f0dd403841c89d156e69d9c5 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Tue, 17 Mar 2026 16:13:35 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day08-=E6=AD=A3=E5=88=99?=
 =?UTF-8?q?=E8=A1=A8=E8=BE=BE=E5=BC=8F=E4=BB=8B=E7=BB=8D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/com/inmind/regex04/Demo16.java        | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 javaSE-day08/src/com/inmind/regex04/Demo16.java

diff --git a/javaSE-day08/src/com/inmind/regex04/Demo16.java b/javaSE-day08/src/com/inmind/regex04/Demo16.java
new file mode 100644
index 0000000..81024f1
--- /dev/null
+++ b/javaSE-day08/src/com/inmind/regex04/Demo16.java
@@ -0,0 +1,40 @@
+package com.inmind.regex04;
+
+import java.util.Arrays;
+
+/*
+    1. Regex：正则表达式是用字符串写成的一种规则
+
+    2. String类的方法matches匹配规则
+        1.  案例：检查QQ号码是否合法,规则: 必须全数字,不能0开头,最低5位,最高12位
+        2.  案例：检查手机号码是否合法,规则：必须1开头,第二位: 34578，全数字,总共11位
+    3. String类的方法split
+        1. 案例：切割字符串，返回数组
+        2. 案例：切割网络ip
+ */
+public class Demo16 {
+    public static void main(String[] args) {
+        //1. 案例：切割字符串，返回数组
+        String str = "刘备,,关羽,,,张飞";
+        String[] strings = str.split(",+");
+        System.out.println(strings.length);
+        System.out.println(Arrays.toString(strings));
+
+        //2. 案例：切割网络ip
+        String ip = "192.168.1.1";
+        String[] ips = ip.split("\\.");//表示普通的点号
+        System.out.println(ips.length);
+        System.out.println(Arrays.toString(ips));
+
+    }
+
+    public static void matchTest(String[] args) {
+        //1.  案例：检查QQ号码是否合法,规则: 必须全数字,不能0开头,最低5位,最高12位
+        String qq = "12345678";
+        boolean matches = qq.matches("[1-9]{1}[0-9]{4,11}");
+        System.out.println(matches);
+        //2.  案例：检查手机号码是否合法,规则：必须1开头,第二位: 34578，全数字,总共11位
+        String tel = "13770858888";
+        System.out.println(tel.matches("[1]{1}[34578]{1}[0-9]{9}"));
+    }
+}