Regex pattern for URL in casperjs

In casperJS I'm writing a test to open a URL in popup.

URL be like this [http://ift.tt/1CE7e11{facility_id}/assessments/{assessment_id}/print_preview][1]

I want to get regex for above URL to be use with withPopup(Mixed popupInfo, Function then)

I have tried these regex patterns

• /assessment/


• /assessment$/


• /print_preview/


• /$print_preview$/

Anyone, please help me in creating right regex for above mentioned URL. Thanks in advace.