Java经典实例：正则表达式，替换匹配的文本

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