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Date format validation using Java Regex
Following example demonstrates how to check whether the date is in a proper format or not using matches method of String class.
Example
public class Main {
public static void main(String[] argv) {
boolean isDate = false;
String date1 = "8-05-1988";
String date2 = "08/04/1987";
String datePattern = "\d{1,2}-\d{1,2}-\d{4}";
isDate = date1.matches(datePattern);
System.out.println("Date :"+ date1+": matches with the this date Pattern:"+datePattern+"Ans:"+isDate);
isDate = date2.matches(datePattern);
System.out.println("Date :"+ date2+": matches with the this date Pattern:"+datePattern+"Ans:"+isDate);
}
}Result
The above code sample will produce the following result.
Date :8-05-1988: matches with the this date Pattern: \d{1,2}-\d{1,2}-\d{4}Ans:true
Date :08/04/1987: matches with the this date Pattern: \d{1,2}-\d{1,2}-\d{4}Ans:falseThe following is an example to check whether date is in the proper format or not.
Example
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String args[]) {
List dates = new ArrayList();
dates.add("25/12/1990");
dates.add("25/12/1990");
dates.add("12/12/90");
dates.add("05/02/1990");
String regex = "^(1[0-2]|0[1-9])/(3[01]|[12][0-9]|0[1-9])/[0-9]{4}$";
Pattern pattern = Pattern.compile(regex);
for(Object date : dates) {
Matcher matcher = pattern.matcher((CharSequence) date);
System.out.println(date +" : "+ matcher.matches());
}
}
}Result
The above code sample will produce the following result.
25/12/1990 : false 25/12/1990 : false 12/12/90 : false 05/02/1990 : true
Updated on: 19-Jun-2020
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