Regular Expressions and String.replaceAll()

**meta1203** · 11-24-2010, 08:34 PM

Hello! This is my first post, so just trying to see how this turns out...
I am writing an NBT (Named Binary Tag) reader. I would like to remove all the double newlines. So:

Java Code:

Hi

Hi again

will be

Java Code:

Hi
Hi again

Here is my code (I am using the JNBT library, look it up if you want it):
IO.java

Java Code:

import java.io.*;
public class IO {


public String strIn() {
BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
String input = null;
try {
input = console.readLine();
}
catch (IOException e) { input = "<" + e + ">"; }
return input;
}

public double numIn()
{
BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
String input = null;
try {
input = console.readLine();
}
catch (IOException e) { input = "<" + e + ">"; }

return Double.parseDouble(input);

}

public void out(String ut) {
System.out.println(ut);
}

public void out(int ut) {
String go = Integer.toString(ut);
out(go);
}

public void out(double ut) {
String go = Double.toString(ut);
out(go);
}

}

NBT.java

Java Code:

import org.jnbt.*;
import java.io.*;

public class NBT {

public static void main(String[] args) {
	// Terminal input
	IO io = new IO();
	
	// Get Directory and Filename of file
	NBTInputStream in = null;
	System.out.println("Directory:");
	String dir = io.strIn();
	System.out.println("File:");
	String file = io.strIn();
	File f = new File(dir,file);
	
	// Get whole data
	try {
		in = new NBTInputStream(new FileInputStream(f));
	}
	catch (IOException e) {
		System.out.println("Opps...");
		System.exit(0);
	}
	
	Tag t = null;
	try {
		t = in.readTag();
	}
	catch (IOException e) {
		System.out.println("ARG! "+e);
		System.exit(0);
	}
	
	String whole = t.toString();
	// Excess stuff Removal
	whole = whole.replaceAll("[{]", "");
	whole = whole.replaceAll("[}]", "");
	whole = whole.replaceAll("[ ]", "");
	whole = whole.replaceAll("entries", "");
	whole = whole.replaceAll("oftype", "");
	// Here is where I am stuck!
	whole = whole.replaceAll("$\n", "\n");
	
	String[] line = null;
	// Split whole data into lines
	line = whole.split("\n");
	// Print out whole data
	System.out.println(whole);
	int x = 0;
	// Split lines into definers and data
	
	String[][] data = new String[java.lang.reflect.Array.getLength(line)][];
	
	while (x<java.lang.reflect.Array.getLength(line)) {
		data[x]=line[x].split("[:]");
		x=x+1;
	} 
	System.out.println(data[2][0]);
	System.out.println(data[2][1]);
}
}