Ruby/File Directory/fnmatch

flags = File::FNM_PATHNAME | File::FNM_DOTMATCH
File.fnmatch("lib/*.rb", "lib/a.rb", flags)      # => true
File.fnmatch("lib/*.rb", "lib/a/b.rb", flags)    # => false
File.fnmatch("lib/**/*.rb", "lib/a.rb", flags)   # => true
File.fnmatch("lib/**/*.rb", "lib/a/b.rb", flags) # => true

File.fnmatch("*.rb", "hello.rb")     # => true
File.fnmatch("*.[ch]", "ruby.c")     # => true
File.fnmatch("*.[ch]", "ruby.h")     # => true
File.fnmatch("?.txt", "ab.txt")      # => false