hpricot：Hpricot::Traverse#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.at('p').search("*")
=> #<Hpricot::Elements[{elem <p> "foo1" </p>}, "foo1"]>
>> doc.at('p').search("p")
=> #<Hpricot::Elements[]>
>> doc = Hpricot('<p><b>foo1</b></p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> {elem <b> "foo1" </b>} </p>} {elem <p> "foo2" </p>}>
>> doc.at('p').search("b")
=> #<Hpricot::Elements[{elem <b> "foo1" </b>}]>
>> doc = Hpricot('<p><b>foo1</b>hoge</p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> {elem <b> "foo1" </b>} "hoge" </p>} {elem <p> "foo2" </p>}>
>> doc.at('p').search("b")
=> #<Hpricot::Elements[{elem <b> "foo1" </b>}]>
>> doc.at('p')
=> {elem <p> {elem <b> "foo1" </b>} "hoge" </p>}