How to Validate Date Format Using Regular Expression in Java

In this example we will show how to validate date format using regular expression in Java. Here you can validate dates in this regular: “((0?[1-9]) | ([012] 1))/((0?[1-9]) | | ([12] d) (3 [01]))/(20) 19 | d {2}”.

Source Code

package com.beginner.examples;

public class VerifyDateExample {

	public static void main(String[] args) {
		
		//
		String reg = "((0?[1-9])|(1[012]))/((0?[1-9])|([12]\d)|(3[01]))/(19|20)\d{2}";
		
		String dateStr1 = "2/02/2019";
		
		String dateStr2 = "13/20/2018";
		
		System.out.println(dateStr1+" : "+ dateStr1.matches(reg));
		
		System.out.println(dateStr2+" : "+ dateStr2.matches(reg));
		
	}

}

Output:

2/02/2019 : true
13/20/2018 : false