Man pages matching name strstr in section 3:

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