Module talk:Check for unknown parameters

Error category should also be added in preview
If there is an error category for unknown parameters then it's only added in the rendered page, not previews which instead show a preview warning. That can be very confusing. Consider for example Copa Libertadores Femenina (permanent link) with Category:Pages using flagicon template with unknown parameters. The page has 135 flagicon. The unknown parameter is in  (should have said size). It's common to track down where a category is added by previewing different parts of the code. That fails here when the category is never added in preview. You can search for the preview warning in the preview but users may not know that. Previews can add things but shouldn't remove things. PrimeHunter (talk) 11:36, 9 December 2023 (UTC)

Lua patterns
Is it possible to add a function to use Lua patterns and also limit the number? For example, if the parameter date can be between date1 and date8 and using  and something like   to limit the allowed parameters? Gonnym (talk) 12:26, 23 June 2024 (UTC)
 * Why not write a specific pattern?
 * —Trappist the monk (talk) 12:59, 23 June 2024 (UTC)
 * Didn't even cross my mind to do that for some reason. I'll try that out, thanks! Gonnym (talk) 13:01, 23 June 2024 (UTC)
 * @Trappist the monk doesn't work. Tested it on TNA Impact! by using the /sandbox version in preview. Gonnym (talk) 13:06, 23 June 2024 (UTC)
 * Nevermind, got it to work without the quotes of course. I'll update the /doc here. Gonnym (talk) 13:09, 23 June 2024 (UTC)
 * You could also look at the check at Interlinear for a fun example. It supports values of 1–99 for some parameters (actually 1 and higher, but I'm hoping nobody will put in more than 99 unnamed parameters). – Jonesey95 (talk) 19:43, 24 June 2024 (UTC)
 * The pattern  (should probably be written  ) is not limited to the range 1–99.    means 0 or more digits.  So, as long as the first digit is not zero, any number of digits (within reason) will be accepted.  If you want to actually limit the range to 1–99 you might use   where (right to left)   anchors the pattern to the end of the parameter name string;   means 0 or 1 digits;   requires the first digit of the enumeration to be in the range 1–9;   is the frontier pattern where the next character is a digit but the previous character is not a digit – in   the pattern finds the boundary between   (parameter name) and   (first digit of the enumerator).
 * —Trappist the monk (talk) 22:00, 24 June 2024 (UTC)