find . -name threads.html -maxdepth 3 -mindepth 3

##</code><code>##

find2perl find . -name threads.html -maxdepth 3 -mindepth 3
Unrecognized switch: -maxdepth

##</code><code>##

File::Find::find({wanted => \&wanted}, 'find', '.');

sub wanted {
    /^threads\.html\z/s;
}