java - 如何将a.txt中的单词与b.txt中的单词交替合并到c.txt中，a.txt中的单词用回车符分隔；b.txt中的单词用回车或空格进行分隔

出现问题：无法按照题目要求将单词交替合并。查找后【发现问题出在正则表达式】，若将两个正则表达式都改为：regex = "\\n*\\s*"; 问题便解决了。

但是现在，我想使用【字符数组】传参数的方式传递正则表达式。
请问怎么实现？？

贴上代码如下：

package cn.itcast;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class MainClass
{
  public static void main(String[] args) throws Exception
  {
    FileManager a = new FileManager("a.txt",new char[]{'\n'});
    FileManager b = new FileManager("b.txt",new char[]{'\n','  '});     

    FileWriter c = new FileWriter("c.txt");

    String aWord = null;
    String bWord = null;

    while((aWord = a.nextWord()) !=null )
    {
        c.write(aWord);
        bWord = b.nextWord();
        if(bWord != null)
            c.write(bWord);
    }

    while((bWord = b.nextWord()) != null){
        c.write(bWord);
  } 
   c.close();
 }

}


class FileManager
{

    String[] words = null;
    int pos = 0;
    public FileManager(String filename,char[] seperators) throws Exception
    {
        File f = new File(filename);
        FileReader reader = new FileReader(f);
        char[] buf = new char[(int)f.length()];
        int len = reader.read(buf);
        String results = new String(buf,0,len);
        String regex = null;
        if(seperators.length >1 ){
                regex = " " + seperators[0] + "|" + seperators[1];
        }else{
            regex = " " + seperators[0];
        }
        words = results.split(regex);
    }

    public String nextWord(){
        if(pos == words.length)
            return null;
        return words[pos++];
        }

 }