Man pages matching name lex in section 1:

lex.1.en	debian 10 / flex
lex.1.en	debian 10 / flex-old
lex.1.es	debian 10 / manpages-es-extra
lex.1.pl	debian 10 / manpages-pl
lex.1.en	debian 11 / flex
lex.1.en	debian 11 / flex-old
lex.1.pl	debian 11 / manpages-pl
lex.1.en	debian 12 / flex
lex.1.en	debian 12 / flex-old
lex.1.da	debian 12 / manpages-da
lex.1.pl	debian 12 / manpages-pl
lex.1.ro	debian 12 / manpages-ro
lex.1.sr	debian 12 / manpages-sr
lex.1.sv	debian 12 / manpages-sv
lex.1.vi	debian 12 / manpages-vi