anti-splog plugin/ pattern matchin

when using the anti-splog plugin and under the tab pattern matching/ add pattern it read Regular Expressions must be in a valid delimited PCRE format. Regex can be very complicated, so it’s recommended to use an online tool like RegExr to build and test them. It is also recommended in most cases to use the “Mark as Splog” action rather than block. This will make it much harder for spammers to learn how to get around your pattern rules, and will also allow the Anti-Splog API to learn from these detected spammers, where do I mark as splog, thank you