Matcher region(int start, int end) 方法在 Java 中，带示例

java.util.regex.Matcher 类表示执行各种匹配操作的引擎。此类没有构造函数，可以使用类 java.util.regex.Pattern 的 matches() 方法创建 / 获取此类的对象。

这个 (Matcher) 类的 region() 方法接受两个表示输入字符串中位置的整数值，并设置当前匹配器的区域。

范例 1

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegionExample {
   public static void main(String[] args) {
      //Regular expression to accepts 6 to 10 characters
      String regex = "\A(?=\w{6,10}\z)";
      System.out.println("Enter 5 to 12 characters: ");
      String input = new Scanner(System.in).next();
      //Creating a pattern object
      Pattern pattern = Pattern.compile(regex);
      //Creating a Matcher object
      Matcher matcher = pattern.matcher(input);
      //Setting region to the input string
      matcher.region(0, 4);
      //Switching to transparent bounds
      if(matcher.find()) {
         System.out.println("Match found");
      } else {
         System.out.println("Match not found");
      }
   }
}

输出

Enter 5 to 12 characters:
sampleText
Match not found

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范例 2

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegionExample {
   public static void main(String[] args) {
      String regex = "(.*)(\d+)(.*)";
      String input = "This is a sample Text, 1234, with numbers in between.";
      //Creating a pattern object
      Pattern pattern = Pattern.compile(regex);
      //Creating a Matcher object
      Matcher matcher = pattern.matcher(input);
      //Setting the region of the matcher
      matcher.region(0, 20);
      if(matcher.matches()) {
         System.out.println("Match found");
      } else {
         System.out.println("Match not found");
      }
   }
}

输出

Match not found

更新于: 2019 年 11 月 20 日

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