Solved

Regulare Expression Validator for date that also allows field to remain blank

Posted on 2011-02-14
5
356 Views
Last Modified: 2012-05-11
I have an optional date field.  This field needs to be checked for proper date mm/dd/yyyy or if blank allow the null.  This feild can have a date in it, and then the user will null the date out if no longer needed.  The validator I use always checks for the date and so does not allow the null.  

Thanks for the help
0
Comment
Question by:rtay
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
5 Comments
 
LVL 16

Expert Comment

by:sjklein42
ID: 34890935
(^$)|(^(0[1-9]|[12][0-9]|3[01])\-(0[1-9]|1[0-2])\-([12][0-9][0-9][0-9])$)

Open in new window

0
 
LVL 16

Accepted Solution

by:
sjklein42 earned 500 total points
ID: 34890950
Prior solution was for hyphenated dates.  This one works for slash-separated dates:

(^$)|(^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/([12][0-9][0-9][0-9])$)

Open in new window

0
 
LVL 5

Author Comment

by:rtay
ID: 34891559
Was this regex supposed to allow the field to be null as well as validate the date?
0
 
LVL 16

Expert Comment

by:sjklein42
ID: 34891589
Yes.  It accepts either an empty string or a valid date.
0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 34891624
A slightly shorter version  : )
^(?:(?:0[1-9]|[12]\d|3[01])/(?:0[1-9]|1[012])/(?:[12]\d{3}))?$

Open in new window

0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Parsing a CSV file is a task that we are confronted with regularly, and although there are a vast number of means to do this, as a newbie, the field can be confusing and the tools can seem complex. A simple solution to parsing a customized CSV fi…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question