Java | Date format validation using Regex

We use java.util.regex.Pattern.compile(String regex) method which compiles the given regular expression into a pattern. Here regex is the expression to be compiled.

// Java program to check if given date is 
// valid or not. 
import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
  
public class GeeksforGeeks { 
  
    // Returns true if d is in format 
    // /dd/mm/yyyy 
    public static boolean isValidDate(String d) 
    { 
        String regex = "^(1[0-2]|0[1-9])/(3[01]"
                       + "|[12][0-9]|0[1-9])/[0-9]{4}$"; 
        Pattern pattern = Pattern.compile(regex); 
        Matcher matcher = pattern.matcher((CharSequence)d); 
        return matcher.matches(); 
    } 
  
    public static void main(String args[]) 
    { 
        System.out.println(isValidDate("10/12/2016")); 
        System.out.println(isValidDate("10/02/18")); 
    } 
} 

Output:

true
false

More ways to validate a date :

SimpleDateFormat class. We can use parse method of this class to validate the date.
Writing our own method to check if a date is valid.

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