Removing the Control Characters from a text file

Question

Hi,
I am using the java.util.regex.* package to removing the control characters from a text file. I got below programming from the java.sun site.
I am able to successfully compile the file and the when I try to run the file I got the error as
------------------------------------------------------------------------D:\Debi\datamigration>java Control
Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal repet
ition
{cntrl}
at java.util.regex.Pattern.error(Pattern.java:1472)
at java.util.regex.Pattern.closure(Pattern.java:2473)
at java.util.regex.Pattern.sequence(Pattern.java:1597)
at java.util.regex.Pattern.expr(Pattern.java:1489)
at java.util.regex.Pattern.compile(Pattern.java:1257)
at java.util.regex.Pattern.<init>(Pattern.java:1013)
at java.util.regex.Pattern.compile(Pattern.java:760)
at Control.main(Control.java:24)
Please help me on this issue.
Thanks&Regards
Debi
import java.util.regex.*;
import java.io.*;
public class Control {
public static void main(String[] args)
throws Exception {
//Create a file object with the file name
//in the argument:
File fin = new File("fileName1");
File fout = new File("fileName2");
//Open and input and output stream
FileInputStream fis =
new FileInputStream(fin);
FileOutputStream fos =
new FileOutputStream(fout);
BufferedReader in = new BufferedReader(
new InputStreamReader(fis));
BufferedWriter out = new BufferedWriter(
new OutputStreamWriter(fos));
     // The pattern matches control characters
Pattern p = Pattern.compile("{cntrl}");
Matcher m = p.matcher("");
String aLine = null;
while((aLine = in.readLine()) != null) {
m.reset(aLine);
//Replaces control characters with an empty
//string.
String result = m.replaceAll("");
out.write(result);
out.newLine();
in.close();
out.close();

Answer 1

Hi,
I used the code below with the \p, but I didn't able to complie the file. It gave me an
D:\Debi\datamigration>javac Control.java
Control.java:24: illegal escape character
Pattern p = Pattern.compile("\p{cntrl}");
^
1 error
Please help me on this issue.
Thanks&Regards
Debi
// The pattern matches control characters
Pattern p = Pattern.compile("\p{cntrl}");
Matcher m = p.matcher("");
String aLine = null;