I useDelimiter \t(ab) with my Scanner, but it splits around spaces

[Simone Cittadini]

I have to parse files like this :

0093Afghanistan0,1775
009370Afghanistan Mobile0,1789
009379 [tab] Afghanistan [space] Mobile [space] Roshan [tab] 0,1789

so I use code like this :

 
File file = fc.getSelectedFile();
Scanner reader = null;
 
try {
  reader = new Scanner(file);
} catch (FileNotFoundException e1) {
  e1.printStackTrace();
}
 
while (reader.hasNext()) {
 
  String line = reader.next();
  Scanner lineReader = new Scanner(line);
  lineReader.useDelimiter("\t");
 
  while (lineReader.hasNext()) {
    System.out.println(lineReader.next());
  }
 
}
 

but I get as output :

0093
Afghanistan
0,1775
009370
Afghanistan
Mobile
0,1789
009379
Afghanistan
Mobile
Roshan
0,1789

instead of what I want :

0093
Afghanistan
0,1775
009370
Afghanistan Mobile
0,1789
009379
Afghanistan Mobile Roshan
0,1789

Where I do wrong ?

[Nick Meverden]

String test = "this" + '\u0009' + "is a" + '\u0009' + "test";
java.util.regex.Matcher m = java.util.regex.Pattern.compile("^(.+)\t(.+)\t(.+)$").matcher(test);
boolean matches = m.matches();
if (matches) {
System.out.println("1 " + m.group(1));
System.out.println("2 " + m.group(2));
System.out.println("3 " + m.group(3));
}

[Alan Moore]

File file = fc.getSelectedFile();
Scanner reader = null;
 
try {
  reader = new Scanner(file);
} catch (FileNotFoundException e1) {
  e1.printStackTrace();
}
 
while (reader.hasNextLine()) {             // <=====
 
  String line = reader.nextLine();         // <=====
  Scanner lineReader = new Scanner(line);
  lineReader.useDelimiter("\t");
 
  while (lineReader.hasNext()) {
    System.out.println(lineReader.next());
  }
 
}

[Simone Cittadini]

ok, I was not understanding how Scanner works, thought the default was to find carriage returns in a text file. Looked what was happening with the debugger and came out with this :

 
File file = fc.getSelectedFile();
Scanner reader = null;
                
try {
  reader = new Scanner(file);
  reader.useDelimiter("\t");
} catch (FileNotFoundException e1) {
    e1.printStackTrace();
}

while (reader.hasNext()) {

  String line = reader.next();
  System.out.println(line);
 
...