JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to validate date format using regular expression in java?


Description:

The below given example shows how to validate date format using regular expression. This example checks for dd/mm/yyyy date format.


Code:
package com.java2novice.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MyDateFormat {

	private static Pattern dateFrmtPtrn = 
			Pattern.compile("(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/((19|20)\\d\\d)");
	
	public static boolean validateDateFormat(String userName){
		
		Matcher mtch = dateFrmtPtrn.matcher(userName);
		if(mtch.matches()){
			return true;
		}
		return false;
	}
	
	public static void main(String a[]){
		System.out.println("Is '03/04/2012' a valid date format? "
						+validateDateFormat("03/04/2012"));
		System.out.println("Is '12/23/2012' a valid date format? "
						+validateDateFormat("12/23/2012"));
		System.out.println("Is '12/12/12' a valid date format? "
						+validateDateFormat("12/12/12"));
		System.out.println("Is '3/4/2012' a valid date format? "
						+validateDateFormat("3/4/2012"));
	}
}

Output:
Is '03/04/2012' a valid date format? true
Is '12/23/2012' a valid date format? false
Is '12/12/12' a valid date format? false
Is '3/4/2012' a valid date format? true
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Interface is similar to a class which may contain method's signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for declaring methods that one or more classes are expected to implement, capturing similarities between unrelated classes without forcing a class relationship and determining an object's programming interface without revealing the actual body of the class.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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