regular expression to extract youtube video id

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C#

regular-expression

file

hi,
I am trying to extract youtube vide id from a text file using regular expression. could anyone please help me with regular expression. following is the sample text from which I need to extract the video id.

<a href="/watch?v=9eKbJJ1I1Jg&list=PLE73ACAC7B7772367&index=1" title="Company of Heroes 2 - Main Theme by Cris Velasco">
        <span class="title video-title">Company of Heroes 2 - Main Theme by Cris Velasco</span>
</a>

<a href="/watch?v=LY0FvYWz1sw&list=PLE73ACAC7B7772367&index=2" title="Ace Combat 6 - The Liberation of Gracemeria by Keiki Kobayashi">
              <span class="title video-title">Ace Combat 6 - The Liberation of Gracemeria by Keiki Kobayashi</span>