Pattern UNIX_LINES field in Java with Examples

This flag enables Unix lines mode. In the Unix lines mode, only '\n' is used as a line terminator and ?\r' is treated as a literal character.

Example 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class LTERAL_Example {
   public static void main(String[] args) {
      String input = "This is the first line\r"
         + "This is the second line\r"
         + "This is the third line\r";
      //Regular expression to accept date in MM-DD-YYY format
      String regex = "^T.*e";
      //Creating a Pattern object
      Pattern pattern = Pattern.compile(regex, Pattern.UNIX_LINES);
      //Creating a Matcher object
      Matcher matcher = pattern.matcher(input);
      int count = 0;
      while(matcher.find()) {
         count++;
         System.out.println(matcher.group());
      }
      System.out.println("Number of matches: "+count);
   }
}

Output

This is the first line
This is the second line
This is the third line
Number of matches: 1

Whereas in normal mode \r is treated as carriage-return.

Example 2

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class LTERAL_Example {
   public static void main(String[] args) {
      String input = "This is the first line\r"
         + "This is the second line\r"
         + "This is the third line\r";
      //Regular expression to accept date in MM-DD-YYY format
      String regex = "^T.*e";
      //Creating a Pattern object
      Pattern pattern = Pattern.compile(regex);
      //Creating a Matcher object
      Matcher matcher = pattern.matcher(input);
      int count = 0;
      while(matcher.find()) {
         count++;
         System.out.println(matcher.group());
      }
      System.out.println("Number of matches: "+count);
   }
}

Output

This is the first line
Number of matches: 1