A transform block consists of lines, where every 2 lines is a transform The first line of each transform is a pattern, and the second is the replacement. 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 depending on the Regression_Test* page being used to initiate the test

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