hpricot：Hpricot::Elements#/, #search

everyday Ruby 
>> require "hpricot"
=> true
>> doc = Hpricot('<p>foo1</p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}>
>> doc / :p
=> #<Hpricot::Elements[{elem <p> "foo1" </p>}, {elem <p> "foo2" </p>}]>
>> doc / "p"
=> #<Hpricot::Elements[{elem <p> "foo1" </p>}, {elem <p> "foo2" </p>}]>
>> (doc / "p")[0]
=> {elem <p> "foo1" </p>}
>> (doc / "p")[1]
=> {elem <p> "foo2" </p>}
>> (doc / "p")[2]
=> nil
>> doc.search :p
=> #<Hpricot::Elements[{elem <p> "foo1" </p>}, {elem <p> "foo2" </p>}]>
>> doc.search "p"
=> #<Hpricot::Elements[{elem <p> "foo1" </p>}, {elem <p> "foo2" </p>}]>
>> doc.search "//p"
=> #<Hpricot::Elements[{elem <p> "foo1" </p>}, {elem <p> "foo2" </p>}]>
>> (doc / "p").search("p")
=> #<Hpricot::Elements[]>
>> (doc / "p").search("*")
=> #<Hpricot::Elements[{elem <p> "foo1" </p>}, "foo1", {elem <p> "foo2" </p>}, "foo2"]>