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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.util.regex.Matcher;
  5. import java.util.regex.Pattern;
  6.  
  7. class Ideone
  8. {
  9. 	public static void main (String[] args) throws java.lang.Exception
  10. 	{
  11. 		String regex = "^(\\d{2}-\\d{2}-\\d{4} \\d{2}:\\d{2}:\\d{2})\\h+-\\h*(.*(?:\\R(?!\\d{2}-\\d{2}-\\d{4} \\d{2}:\\d{2}:\\d).*)*)";
  12. 		String string = "28-03-2020 23:00:00 - This\n"
  13. 	 + "is\n"
  14. 	 + "line\n"
  15. 	 + "1\n\n"
  16. 	 + "28-03-2021 14:23:15 - This\n"
  17. 	 + "is\n"
  18. 	 + "line\n"
  19. 	 + "2\n\n\n\n"
  20. 	 + "28-03-2020 23:00:00 - This\n"
  21. 	 + "is\n"
  22. 	 + "12\n"
  23. 	 + "line\n"
  24. 	 + "1";
  25.  
  26.         Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
  27.         Matcher matcher = pattern.matcher(string);
  28.  
  29.         while (matcher.find()) {
  30.             System.out.println(matcher.group(1));
  31.             System.out.println(matcher.group(2));
  32.             System.out.println("--------------------");
  33.         }
  34. 	}
  35. }
Success #stdin #stdout 0.07s 48484KB
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stdin
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Standard input is empty
stdout
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28-03-2020 23:00:00
This
is
line
1

--------------------
28-03-2021 14:23:15
This
is
line
2



--------------------
28-03-2020 23:00:00
This
is
12
line
1
--------------------
https://ideone.com/daD4nl
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
secret

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