I need to eliminate all special characters in my file except "space" .. Please check the program below and tell me what I need to change

import java.io.*;
import java.util.Scanner;
public class TestScript	
	public static void main(String args[]) throws Exception
		System.out.println("Please Enter the filename\n");
		Scanner sc = new Scanner(System.in);
		String filename=sc.nextLine();
		BufferedReader br =new BufferedReader(new FileReader(filename));
		String str;
		BufferedWriter br1= new BufferedWriter(new FileWriter("textfile1.txt"));
			String pattern= "[^(A-Z||a-z||\t||[0-9])";
			String p=str.replaceAll(pattern,"");
		File f = new File(filename);
		boolean bol = f.delete();
		File f1 = new File("textfile1.txt");
		f1.renameTo(new File(filename));

Actually the space is also being eliminated .. Is there any problem with it?


Wht do I do if I have to keep only one space and deleted the remaining spaces

For example if its "asdf asdf". Then how can i get it to look like
"asdf asdf".

Sorry but actually the above post intended to have multiple spaces between the two words but the post edited it to a single space ... I want to do exactly the samething. Thanks

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