import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		List<String> list = Arrays.asList(
			new String[]{
				"10/02/1992 or 1992",
				"10/02/1992",
				"10/1992",
				"02/1992",
				"1992",
				"1234 5694 7487"
 
				}
			);
 
		String regex = ".*?(?:(?:[0-9]{2}[/-]){2}[0-9]{4}|[0-9]{4}(?:\\h[0-9]{4}){2}).*";
 
		for (String str: list) {
			if (str.matches(regex)){
		    	System.out.println(str);
			}
		}
	}
}

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