Man pages matching name config::model::models::itself::commonelement::warnifmatch in section 3pm:

Config::Model::models::Itself::CommonElement::WarnIfMatch.3pm.en	debian 10 / libconfig-model-itself-perl
Config::Model::models::Itself::CommonElement::WarnIfMatch.3pm.en	debian 11 / libconfig-model-itself-perl
Config::Model::models::Itself::CommonElement::WarnIfMatch.3pm.en	debian 12 / libconfig-model-itself-perl