提取以特定的字符串开头和结尾的正则表达式

package com.test.mytest.study;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Demo001 {

public static void writeFile(String strSrc) {
FileWriter writer = null;
FileReader reader = null;
BufferedReader br = null;
BufferedWriter bw = null;

try {

reader = new FileReader(strSrc);
File filestrSrc = new File(strSrc);
String str = null;

br = new BufferedReader(reader);

StringBuffer sb = new StringBuffer("");
while ((str = br.readLine()) != null) {
String a=   str.replaceAll(".ff(.*)}", "");
a=a.replaceAll("\\@font-face\\{font-family", "");
//空行不读入新文件里面。
 if(!"".equals(a)){
                     sb.append(a + "\n");
                }

}
filestrSrc.delete();
File file = new File(strSrc);
if (!file.exists()) {
file.createNewFile();
}

// 这里的true，是以追加的方式写
writer = new FileWriter(strSrc, true);
bw = new BufferedWriter(writer);
bw.write(sb.toString());
br.close();
reader.close();

bw.close();
writer.close();

} catch (IOException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
Demo001.writeFile("/home/xueqy/html.css");
}
}