Java经典实例：正则表达式，替换匹配的文本详解编程语言

import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
 
/** 
 * Created by Frank 
 * 替换匹配的文本 
 */ 
public class ReplaceDemo { 
    public static void main(String[] args) { 
        // 创建一个正则表达式模式，用以匹配一个单词（/b=单词边界） 
        String patt = "//bfavor//b"; 
 
        // 用于测试的输入字符串 
        String input = "Do me a favor? Fetch my favorites.AAA favor BBB"; 
        System.out.println("Input:" + input); 
 
        // 从正则表达式实例中运行方法并查看其如何运行 
        Pattern r = Pattern.compile(patt); 
        Matcher m = r.matcher(input); 
        System.out.println("ReplaceAll:" + m.replaceAll("favour")); 
 
        // appendReplacement方法 
        m.reset(); 
        StringBuffer sb = new StringBuffer(); 
        while (m.find()) { 
            // 将匹配之前的字符串复制到sb,再将匹配结果替换为："favour"，并追加到sb 
            m.appendReplacement(sb, "favour"); 
        } 
        System.out.println(sb.toString()); 
        m.appendTail(sb); 
        System.out.println(sb.toString()); 
    } 
}

Input:Do me a favor? Fetch my favorites.AAA favor BBB 
ReplaceAll:Do me a favour? Fetch my favorites.AAA favour BBB 
Do me a favour? Fetch my favorites.AAA favour 
Do me a favour? Fetch my favorites.AAA favour BBB