hw for section20

YsGBt · YsGBt · commit c61d6e2d12d6 · 2022-06-20T18:40:45.000-07:00
diff --git a/src/main/java/homework/section20/CheckEmail.java b/src/main/java/homework/section20/CheckEmail.java
@@ -0,0 +1,10 @@
+package homework.section20;
+
+public class CheckEmail {
+
+  public static void main(String[] args) {
+    String email = "zsy@sina.com";
+    String regex = "^\\w+@\\w+(\\.[a-zA-Z]{2,3}){1,2}$";
+    System.out.println(email.matches(regex));
+  }
+}
diff --git a/src/main/java/homework/section20/CheckPhoneNumber.java b/src/main/java/homework/section20/CheckPhoneNumber.java
@@ -0,0 +1,13 @@
+package homework.section20;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class CheckPhoneNumber {
+
+  public static void main(String[] args) {
+    Pattern pattern = Pattern.compile("^\\d{11}$", Pattern.CASE_INSENSITIVE);
+    Matcher matcher = pattern.matcher("18637866964");
+    System.out.println(matcher.find());
+  }
+}
diff --git a/src/main/java/homework/section20/RemoveDuplicate.java b/src/main/java/homework/section20/RemoveDuplicate.java
@@ -0,0 +1,12 @@
+package homework.section20;
+
+
+public class RemoveDuplicate {
+
+  public static void main(String[] args) {
+    String str = "我我我、、、我我、、我要、我要要、、、要要要、、要要、、学学学、、、、学学编、、、学编编编、、编编编程、、程程";
+    str = str.replaceAll("(、+)", "");
+    str = str.replaceAll("(.)\\1+", "$1");
+    System.out.print(str); // 我要我要学编学编程
+  }
+}
