Apparently I don’t understand regexes (or Re2 style regexes) well enough; I am using a Cloudflare firewall rule that matches URI ^/p/* , but it is also matching URIs like “/p-abcd/1234” and not just URIs like /p/1234 and I can’t figure out why.
Any regular expression wizards around? 
I’m not specifically familiar with Cloudflare’s firewall rules, but…
In RE2 and other similar regular expressions, * means “0 or more of the previous thing”. So ^/p/* is basically equivalent to ^/p and matches all paths that start with /p, whether or not the following character is a /.
Not sure what Cloudflare prefers, but you may want to switch it to ^/p/ or something similar. (That would not match the exact path /p, though.)
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