正则表达式示例

Author: enjoyCoding666

src/main/java/com/regex/PatternDemo2.java

@@ -0,0 +1,21 @@
+package com.regex;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class PatternDemo2 {
+	public static void main(String args[]){
+		String str="1983-07-27";
+		String pat="\\d{4}-\\d{2}-\\d{2}";
+		Pattern p=Pattern.compile(pat);   //先声明模式
+		Matcher m=p.matcher(str);    //接着再匹配
+		if(m.matches())  {
+			System.out.println("日期格式各法");
+		}else {
+			System.out.println("日期格式不合法");
+
+		}
+
+
+	}
+}

src/main/java/com/regex/RegexDemo.java

@@ -1,21 +1,57 @@
 package com.regex;
 
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
+/**
+ * @Author: lenovo
+ * @Date: 2020/2/2 21:46
+ * @Description:
+ *
+ * 详情参见：https://www.cnblogs.com/expiator/p/12250598.html
+ */
 public class RegexDemo {
-	public static void main(String args[]){
-		String str="1983-07-27";
-		String pat="\\d{4}-\\d{2}-\\d{2}";
-		Pattern p=Pattern.compile(pat);   //先声明模式
-		Matcher m=p.matcher(str);    //接着再匹配
-		if(m.matches())  {
-			System.out.println("日期格式各法");
-		}else {
-			System.out.println("日期格式不合法");
 
-		}
+    public static void regex1(){
+        String str="abcdddabc";
+        String regex=".*d+.*";
+        if (str.matches(regex)){
+            System.out.println(true);
+        }
+    }
+
+    public static void regex2(){
+        String str="abcdefg";
+        String regex=".*efg";
+        if (str.matches(regex)){
+            System.out.println(true);
+        }
+    }
+
+
+    public static void regex3(){
+        String str="a";
+        String regex="\\w";
+        if (str.matches(regex)) {
+            System.out.println(true);
+        }
+    }
+
+    public static void regex4(){
+        String str="abdf1459";
+        String regex="[a-z]{4}[1-9]{4}";
+        if (str.matches(regex)) {
+            System.out.println(true);
+        }
+    }
+
 
+    public static void regex6(){
+        String str="catdog";
+        String regex="^cat$";
+        String regex2="^cat.*";
+        String regex3=".*dog$";
+        boolean isMatch1=str.matches(regex);
+        boolean isMatch2=str.matches(regex2);
+        boolean isMatch3=str.matches(regex3);
+        System.out.println(isMatch1+","+isMatch2+","+isMatch3);
+    }
 
-	}
 }

src/main/java/com/regex/RegexTest.java renamed to src/main/java/com/regex/RegexLetterTest.java

@@ -3,7 +3,7 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-public class RegexTest {
+public class RegexLetterTest {
 	public static void main(String args[]){
 		//输入字符串，然后验证是否符合格式
 		String str="QQabc4755";

src/main/java/com/string/CharSwapDemo.java

@@ -1,6 +1,7 @@
 package com.string;
 
 import com.alibaba.druid.sql.visitor.functions.Char;
+import org.apache.commons.lang.StringUtils;
 
 /**
  * @Author: lenovo
@@ -22,4 +23,11 @@ public static String swapCharInString(String str) {
         return sb.toString();
     }
 
+    public static String reveserString() {
+        String str="abcd";
+        String str2 = StringUtils.reverse(str);
+        System.out.println(str2);
+        return str2;
+    }
+
 }

src/test/java/com/regex/RegexDemoTest.java

@@ -0,0 +1,45 @@
+package com.regex;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * @Author: lenovo
+ * @Date: 2020/2/2 21:54
+ * @Description:
+ */
+class RegexDemoTest {
+
+    @Test
+    void regex1() {
+        RegexDemo.regex1();
+    }
+
+
+    @Test
+    void regex2() {
+        RegexDemo.regex2();
+    }
+
+
+
+
+    @Test
+    void regex3() {
+        RegexDemo.regex3();
+    }
+
+    @Test
+    void regex4() {
+        RegexDemo.regex4();
+    }
+
+
+    @Test
+    void regex6() {
+        RegexDemo.regex6();
+    }
+
+
+}

src/test/java/com/string/CharSwapDemoTest.java

@@ -16,4 +16,10 @@ void swapCharInString() {
         String s = CharSwapDemo.swapCharInString("abcd");
         System.out.println(s);
     }
+
+    @Test
+    void reveserString() {
+        CharSwapDemo.reveserString();
+
+    }
 }