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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String str = "01/02/1234 - 16:40 Declan - Hello!02/04/2584 - 17:54 John - Hi!";
		String[] lines = str.split((0[1-9]|[10-31])/(0[1-9]|[10-12])/[20[16-17]);
	}
}

Main.java:14: error: illegal start of expression
		String[] lines = str.split((0[1-9]|[10-31])/(0[1-9]|[10-12])/[20[16-17]);
		                                   ^
Main.java:14: error: ')' expected
		String[] lines = str.split((0[1-9]|[10-31])/(0[1-9]|[10-12])/[20[16-17]);
		                                    ^
Main.java:14: error: ';' expected
		String[] lines = str.split((0[1-9]|[10-31])/(0[1-9]|[10-12])/[20[16-17]);
		                                         ^
3 errors

Standard output is empty