import java.io.FileInputStream;
import java.io.IOException;
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 CharSequence fromFile(String filename) throws IOException {
FileInputStream fis = new FileInputStream(filename);
FileChannel fc = fis.getChannel();
// Create a read-only CharBuffer on the file
ByteBuffer bbuf = fc.map(FileChannel.MapMode.READ_ONLY, 0, (int) fc.size());
CharBuffer cbuf = Charset.forName("8859_1").newDecoder().decode(bbuf);
return cbuf;
}
public static void main(String[] argv) throws Exception {
// Create matcher on file
Pattern pattern = Pattern.compile("pattern");
Matcher matcher = pattern.matcher(fromFile("infile.txt"));
// Find all matches
while (matcher.find()) {
// Get the matching string
String match = matcher.group();
}
}
}