本程序的功能是，根据用户输入的文件名，在相应的文件内容中查找匹配给定模式的字符串，并将这些字符串显示出来。模式串为“href="…"”。请填写横线处的内容。

注意：请勿改动main()主方法和其他已有语句内容，仅在横线处填入适当语句。

import java.io.*;

import java.util.regex.*;

import javax.swing.*;

public class Example2_10

{

public static void main(String [] argv)

{

final String patternString =

"href\\s*=\\s*(\"[^\"]*\"|[^\\s＞])\\s*;

String fileName ;

try

{

System. out. print ( "请输入html 文件的文件名: ");

InputStreamReader in = new InputStreamReader(System.in);

BufferedReader imput = new BufferedReader(in);

fileName = imput.readLine();

if(fileName.equals(" "))

return;

StringBuffer buffer = new StringBuffer();

File file = new File(fileName);

FileInputStream readfile = new FileInputStream(file);

for(int c = 0; (c = readfile.read()) != -1; )

buffer.append((char)c);

Pattern pattern = Pattern.compile(

_____________ Pattern.CASE_INSENSITIVE);

Matcher matcher =________;

while (marcher. find ())

{

int start = matcher.start();

int end = matcher.end();

String match = buffer.substring(start, end);

System.out.println (match);

}

}

catch (Exception excption)

{

System. out.println (excption. getMessage ());

}

System.exit(O);

}

}