如何使用 Java 在字符串中搜索特定单词

问题描述

如何在字符串中搜索特定单词?

解决方案

以下示例演示如何借助 regex.Matcher 类的 matcher.start() 方法在字符串中搜索特定单词。

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
   public static void main(String args[]) {
      Pattern p = Pattern.compile("j(ava)");
      String candidateString = "This is a java program. This is another java program.";
      Matcher matcher = p.matcher(candidateString);
      int nextIndex = matcher.start(1);
      
      System.out.println(candidateString);
      System.out.println("The index for java is:" + nextIndex);
   }
}

结果

上述代码示例将产生以下结果。

This is a java program. This is another java program.
The index for java is: 11

以下是在字符串中搜索特定单词的示例。

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
   public static void main(String[] args) {
      String s1 = "sairamkrishna mammahe Tutorials Point Pvt Ltd";
      String regex = "\bPoint\b";
      Pattern p1 = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
      Matcher m1 = p1.matcher(s1);
      
      while (m1.find()) {
         System.out.print("Start index: " + m1.start());
         System.out.print(" End index: " + m1.end() + " ");
         System.out.println(m1.group());
      } 
   }
}

上述代码示例将产生以下结果。

Start index: 32 End index: 37 Point