bulk edit, regex, url from comments

In "Bulk Edit"... Search/Replace... I need help with using regex to pull a URL from the comments html source.

This works in Notepad++:
SEARCH = (.*?<p>)(http.*\:\/\/.*?)(</p>)
REPLACE = \2

But it does not work in Calibre

Would anyone help me with this regex question?

Thank you :-)