Man pages matching name regex in section 3:

regex.3.en	debian 10 / manpages-dev
regex.3.es	debian 10 / manpages-es
regex.3.ja	debian 10 / manpages-ja-dev
regex.3.pt	debian 10 / manpages-pt-dev
regex.3.en	debian 11 / manpages-dev
regex.3.es	debian 11 / manpages-es-dev
regex.3.fr	debian 11 / manpages-fr-dev
regex.3.ja	debian 11 / manpages-ja-dev
regex.3.pt	debian 11 / manpages-pt-dev
regex.3.de	debian 12 / manpages-de-dev
regex.3.en	debian 12 / manpages-dev
regex.3.es	debian 12 / manpages-es-dev
regex.3.fr	debian 12 / manpages-fr-dev
regex.3.ja	debian 12 / manpages-ja-dev
regex.3.de	debian 13 / manpages-de-dev
regex.3.en	debian 13 / manpages-dev
regex.3.fr	debian 13 / manpages-fr-dev
regex.3.ja	debian 13 / manpages-ja-dev