So I figured it out... but for those who need to know:  You can put the expression (e.g. value % 2 == 0) or the regex between the validator tags.  I guess you have to use the keyword "value" for a mathematical  expression or a regex to access the value of the field.  So my validator for checking if the number was even looked like this:

<validator type="expression" message="Window Size must be even">value % 2 == 0</validator>

- Nik.

On Tue, Aug 9, 2011 at 5:47 PM, Nikhil Joshi <nikhil.ashok.joshi@gmail.com> wrote:
Hi all,

I would like to use the validator tag to validate data using either regexes or math expressions.  How can I do this?  I tried using the "regex" type, but I'm not sure where to put the regex itself.  I tried putting it in a file that was in the filename attribute, but that didn't seem to work.  Essentially, I want to check if an integer input is even or not.

- Nik.

--
Nikhil Joshi
Bioinformatics Programmer
UC Davis Genome Center
University of California, Davis
Davis, CA
http://bioinformatics.ucdavis.edu



--
Nikhil Joshi
Bioinformatics Programmer
UC Davis Genome Center
University of California, Davis
Davis, CA
http://bioinformatics.ucdavis.edu