I've been using the (bassistance.de) url validation plugin and would like to customize it to allow additional special characters, such as the "pipe" | character. My understanding of regex is limited, so I would appreciate any ideas on how this can be done.

 

Based on the demos for url validation at http://jquery.bassistance.de/validate/demo/, it does not allow the pipe character and shows "Please enter a valid url" error message. From what I understand, the pipe may not be a valid character according to ISO standards, but nonetheless used by several sites.