Search for pattern in file

hi Sathya ,
 the solution to your problem is in jdk1.4 beta release.
it offers lot flexibility of such type of searching patterns , in a file.
The new packages you have to use

import java.util.regex.*;
import java.nio.*;
import java.nio.charset.*;
import java.nio.channels.*;

i am attaching the sample code for help and implementation.

File Searching

/*
 * Prints out the comments found in a .java file.
 */
import java.util.regex.*;
import java.io.*;
import java.nio.*;
import java.nio.charset.*;
import java.nio.channels.*;

public class CharBufferExample {
    public static void main(String[] args) throws Exception {
        // Create a pattern to match comments
        Pattern p =
            Pattern.compile("//.*$", Pattern.MULTILINE);
       
        // Get a Channel for the source file
        File f = new File("test.java");
        FileInputStream fis = new FileInputStream(f);
        FileChannel fc = fis.getChannel();
       
        // Get a CharBuffer from the source file
        ByteBuffer bb =
            fc.map(FileChannel.MAP_RO, 0, (int)fc.size());
        Charset cs = Charset.forName("8859_1");
        CharsetDecoder cd = cs.newDecoder();
        CharBuffer cb = cd.decode(bb);
       
        // Run some matches
        Matcher m = p.matcher(cb);
        while (m.find())
            System.out.println("Found comment: "+m.group());
    }
}


here you replace the search by your pattern dotproduct.ppc_le in the line pattern.compile.

this i think will solve the problem of searching varied patterns in a file.

bhuvneshsharma, please read the guideline below on proposing answers. As your program can only run on JDK1.4, what makes you say that it is the best solution?

If you are searching for a simple substring, yongsing's answer is definitely sufficient. (Don't make the solution any more complex or elegant than is demanded by the problem.)

On the other hand, if you want to search for more complex expressions, and you don't want to wait for JDK 1.4 or can't use JDK 1.4, you might consider one of these regex packages:
    http://www.alphaworks.ibm.com/tech/regex4j
    http://jakarta.apache.org/regexp/index.html
    http://jakarta.apache.org/oro/index.html
    http://www.cacas.org/~wes/java/

Best regards,
Jim Cakalic

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Moondancer, I noticed that you guys are awarding the points automatically to the proposed answer, even though the proposed answer may not be "a specific solution to a problem". It is unfair to the others who had given comments, which could be better answers than the proposed answer.

Did you notice these line from Moondancer's previous posts?

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------------>  EXPERTS:  Please leave any comments regarding your closing recommendations

Jim

Thanks to you both.  yongsing.... it is CRITICAL that the experts in their respective areas of expertise answer our requests.  We are only a handful of Moderators and are handling @ 176 TAs.  We can't know all subjects as the experts.  

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Moondancer - EE Moderator

Proposed Answer rejected.

Experts interesting in helping the cleanup effort:
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For this question, I suggest you split the points to the three persons who responded.

yongsing responded first with what would appear to be a workable solution. My comment was only intended to direct attention to alternatives, not really a proposed solution to the problem. My recommendation is that yongsing be given the points.

Thanks, Moondancer.
:-)

Thanks to you both...
Points for jim_cakalic -> https://www.experts-exchange.com/jsp/qManageQuestion.jsp?qid=20283076
Split finalized.
Moondancer - EE Moderator