[рони]

Вариант )))

var str = 'http://www.youtube.com/watch?feature=df3232&v=H9H0ocq1wLs&olo=11',
str2 = 'http://www.youtube.com/watch?v=H9H0ocq1wLs';
alert(  [str.split( /[\S\s]*v=|&/)[1],str2.split( /[\S\s]*v=|&/)[1]]  )