A transform block consists of lines, where every 2 lines is a transformThe first line of each transform is a pattern, and the second is thereplacement.  These are passed to re.sub, like so:re.sub(pattern, replacement, page_data)

Here is the set of transforms for the mobile.header page

these ignore the value of the title field on the page, which changes dependingon the Regression_Test* page being used to initiate the test

transforms<title>.* -<title>TEST -}}}

{{{transforms<title>.* -<title>TEST -}}}