java使用正则表达式将xml文本中的特定的标签替换掉

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

/*
*
* 使用正则表达式将文本中的 
替换成空字符串 ，复制他人博客，
* 有时候代码块前面的序号会在代码下面，将ul替换，就不会显示序号
* */
public class Main2 {

    static File file2 = new File("E:/paper/blog0.xml");//Persons.xml文件绝对路径
    static File file3 = new File("E:/paper/blog1.xml");//Persons.xml文件绝对路径

    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file2)));
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file3)));

        String tmpStr="";

        String regStr = "
(.*)
";
        Pattern pattern = Pattern.compile(regStr);

        while((tmpStr=reader.readLine())!=null){
            Matcher m = pattern.matcher(tmpStr);
            if (m.find()) {
                String strFind = m.group(0);
                tmpStr = tmpStr.replace(strFind, "");
            }
            writer.write(tmpStr);
        }

        writer.flush();
        reader.close();
        writer.close();
    }
}