foo 2 foo 3 ffoo 4 f_oo frink 5 _foo foo 6 _ffoo bar 7 f_foo baz 8 foobar quux 9 ffoooo__bbaarr ichi 10 _fo_o___bbaarr ni 11 http://ffoo.com/ 12 http://foo.com// 13 http://foo.com/ 14 http://bar.com/http://www.baz.com/ 15 hhttp://foo.com/ 16 _http://foo.com/ 17 h_ttp://foo.com/ 18 xx x x   xxx f __ _ xyx foo