I have a form where the user wants to know how many hours someone has worked on a project but only in half hour increments.  I could easily create a drop down box with values like 0.5, 1.0, 1.5, etc. but that could grow painfully long and I need to account for all possible values. 

Is it possible with any of the validators or other tricks to do this check for me and only allow users to type in whole numbers or numbers that end in .5?

I have another work around in mind that is kind of weak so I thought I would check to see if there is something better I can try.

Thanks.

Running Form Master 2008 2.0.8 on DNN 4.9

Yeags,

Use a Required and a RegulaExpression validator. below is your regular expression

^\d{1,2}\.[05]$

that worked perfectly.  Thanks.  I know there is so much more I can be doing with validation and regular expressions.  I have to google that and look into it more.  do you know of any good sites for that off the top of your head?

Thanks again!

I use http://www.regexbuddy.com to help create expressions. It is a great inexpensive tool that makes me look good