import java.io.BufferedReader;
import java.io.FileReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] argv) throws Exception {
String filename = "infile.txt";
String patternStr = "pattern";
BufferedReader rd = new BufferedReader(new FileReader(filename));
Pattern pattern = Pattern.compile(patternStr);
Matcher matcher = pattern.matcher("\\D");
String line = null;
while ((line = rd.readLine()) != null) {
matcher.reset(line);
if (matcher.find()) {
// line matches the pattern
}
}
}
}