Apply Regular Expressions on the contents of a file : Serialization « Regular Expressions « Java






  1. Java
  2. Regular Expressions
  3. Serialization

Apply Regular Expressions on the contents of a file

 
 
import java.io.FileInputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
  public static void main(String[] argv) throws Exception {
    Pattern pattern = Pattern.compile("pattern");
    FileInputStream input = new FileInputStream("file.txt");
    FileChannel channel = input.getChannel();

    ByteBuffer bbuf = channel.map(FileChannel.MapMode.READ_ONLY, 0, (int) channel.size());
    CharBuffer cbuf = Charset.forName("8859_1").newDecoder().decode(bbuf);

    Matcher matcher = pattern.matcher(cbuf);
    while (matcher.find()) {
      String match = matcher.group();
      System.out.println(match);
    }
  }
}








Related examples in the same category

1.Use FileChannels and ByteBuffers to Store Patterns
2.Using a Regular Expression to Filter Lines from a Reader
3.Reading Lines from a String Using a Regular Expression