Question

I’m looking for a regex string that will validate dates formatted as yyyyMMdd (no delimiters) and works for leap years. The closest thing I found so far only validates dates since 2000.

import java.util.regex.Pattern;

public class TestDate {
  public static final Pattern datePattern = Pattern.compile("** Need RegEx **");

  public static void main(String[] args) {
    System.out.println(datePattern.matcher("19960229").matches());
  }
}

Answer 1

I suggest using the java.text.DateFormat as shown in this page :

public static boolean isValidDateStr(String date) {
    try {
      SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
      sdf.setLenient(false);
      sdf.parse(date);
    }
    catch (ParseException e) {
      return false;
    }
    catch (IllegalArgumentException e) {
      return false;
    }
    return true;
  }