I have been searching for syntax definitions for rules of the DNN 4.7+ Friendly URL feature but can only find the user manual post with very basic information on adding and deleting rules. What is \d? Are there other switches? What are they? What is the proper way to include them (\d+)?

Is there some more detailed Host documentation that I am missing?

I guess to answer your direct question and given a small tutorial, \d is the code for a digit (0-9).  The + after it means "one or more."  so \d+ is one or more digits, i.e. a number with an unlimited amout of digits.

Similarly, * means "zero or more," while ? means "zero or one."  \w means "word character (A-Z, a-z, 0-9), \s means a whitespace character (space, tab, etc), and * means any character.

Hope that helps,

It looks like you're wanting to use a Human Friendly URL rewriter.  If you just want to create a simple link for a single page, you can set that up using a URL Rewrite rule, but if you want this scheme for your whole site, look into using a new Friendly URL Provider altogether.

To write a single rewrite page, you could use a rule like MATCH: ".*/promo1" REPLACE WITH: "~/Default.aspx?tabid=155"

Hope it helps,