Scanner delimiter problems...

Question

hey everyone,
I am attempting to read from a file using Scanner and wanted to change the delimiter so that it would read through the file and pick out the info I need.
However when i try
Scanner inputStream = new Scanner(new FileReader(file));
                inputStream.useDelimiter("\\n(), *[]");I get the following error after my program runs.
java.util.regex.PatternSyntaxException: Unclosed character class near index 8
\n(), *[]
^
(the carrot should be under the last bracket)
I think its because the parenthesis and brackets need to be expressed in a different way? I checked out the Pattern class but couldn't find anything with parenthesis. hoping you guys could help
Thanks in advance,
Tomek
Edited by: sstomek on May 4, 2008 3:55 PM

Answer 1

how can I escape those characters? Well even if i do not use the square brackets or parenthesis or asterisks, true the error does go away but my output is still not correct. Let me elaborate a bit. Here is an extended bit of my code...
Scanner inputStream = new Scanner(new FileReader(file));
                inputStream.useDelimiter("\\n\\s");
                if (inputStream.hasNextInt())
                    numVertices = inputStream.nextInt();
                System.out.println(numVertices);the beginning of the file I am reading from looks like this:
25
(934.39, 893.10)
(336.22, 622.56)
(205.64, 835.67)
(527.40, 188.27)
........and so on for 21 more lines
So the only information that is important to me is that first integer and then those double pairs. So I want the scanner to omit any spaces, commas, parenthesis, and brackets.
However my output is 0 instead of 25
-Tomek
Edited by: sstomek on May 4, 2008 4:32 PM
Edited by: sstomek on May 4, 2008 4:36 PM