Topic on Extension talk:AbuseFilter

I'm trying to learn how to use the AbuseFilter, to deal with a quite annoying vandalizer on sc.wiki, but the guides Extension:AbuseFilter/Rules_format and Extension:AbuseFilter/Conditions guides are not enough for me to understand it and configure it well. For example, watching the en.wiki filters I discovered that the category for articles is "page_namespace == 0" and for user talk pages is "page_namespace == 2", but where can I find the list for all of the other kinds of pages? And what does "irlike" mean, exactly? Because I used it in a filter, but then it gave me a few false positives and I had to change it. And how can I specify not words or characters, but changes like adding multiple empty paragraphs?

To make an example, I need a filter to block edits like this one, where that same vandal has been adding empty paragraphs to an article (sometimes adding text before it, like here) but I don't know how to do it. Is there any other guide where I could read which variables are available and what all of those variables do?

For example, watching the en.wiki filters I discovered that the category for articles is "page_namespace == 0" and for user talk pages is "page_namespace == 2", but where can I find the list for all of the other kinds of pages?

With apologies for singling this point out, these are namespace numbers, and a full list of them can be found at w:Wikipedia:Namespace (for the English Wikipedia; you can get the list of namespaces specific to the Sardinian Wikipedia via the API). (Also, the namespace with number 2 is User, not User talk, which is instead 3 - you can remember content versus talk namespaces because content namespaces always have an even number, while talk namespaces always have an odd number.)

One start point is Special:AbuseFilter/examine, where you can examine past edits and test code against it.

For empty lines, you can use \n that represents a new line. added_lines can be used to test only for the lines added/modified during the change, and write a regular expression like added_lines rlike '\n{10,}' which should match the addition of 10 or more lines in a row

To add to what others said, see also: m:Small wiki toolkits/Starter kit/AbuseFilter, and w:Regular expression.

Also, while we do try to make guides easy to read and understand, one should always keep in mind that AbuseFilter is a "technical" tool. No matter how guides are simplified, they will always assume some prerequisites; at minimum, this means the basis of boolean logic and value/type comparisons; ideally, also string manipulation and regular expressions.

These concepts aren't too difficult to learn, and I always encourage people to try. However, it's very important to prevent any collateral damage while experimenting with AF. For this reason, I highly recommend avoiding to enable any filter consequence if you're not sure of the result. It shouldn't even warn the user, let alone disallow or block them.

@Dinoguy1000, @Ciencia Al Poder and @Daimona Eaytoy, thank you very much to all of you for the informations and the suggestions! I will start reading the material right now.