Man pages matching name catmandu::validator::simple in section 3pm:

Catmandu::Validator::Simple.3pm.en	debian 10 / libcatmandu-perl
Catmandu::Validator::Simple.3pm.en	debian 11 / libcatmandu-perl
Catmandu::Validator::Simple.3pm.en	debian 12 / libcatmandu-perl