Java中的模式pattern方法及示例

2024-05-19 21:00:06 478

例子1

import java.util.regex.Pattern; public class PatternExample { public static void main(String[] args) { String date = "12/09/2019"; String regex = "^(1[0-2]|0[1-9])/(3[01]|[12][0-9]|0[1-9])/[0-9]{4}$"; //创建一个模式对象 Pattern pattern = Pattern.compile(regex); if(pattern.matcher(date).matches()) { System.out.println("Date is valid"); } else { System.out.println("Date is not valid"); } //检索当前模式的正则表达式 String regularExpression = pattern.pattern(); System.out.println("Regular expression: "+regularExpression); } }

输出结果

Date is valid
Regular expression: ^(1[0-2]|0[1-9])/(3[01]|[12][0-9]|0[1-9])/[0-9]{4}$

例子2

public class PatternExample {
   public static void main(String[] args) {
      String input = "Hi my id is 056E1563";
      //使用组的正则表达式
      String regex = "(.*)?(\\d+)";
      //创建一个模式对象
      Pattern pattern = Pattern.compile(regex);
      if(pattern.matcher(input).matches()) {
         System.out.println("Match found");
      } else {
         System.out.println("Match not found");
      }
      //检索当前模式的正则表达式
      String regularExpression = pattern.pattern();
      System.out.println("Regular expression: "+regularExpression);
   }
}

输出结果

Match found
Regular expression: (.*)?(\d+)

Java中的模式pattern方法及示例

例子1

例子2

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