title: Can I use an OR statement to indicate the pattern in stringr's str_extract_all function?
body: <p>I'm looking at a number of cells in a data frame and am trying to extract any one of several sequences of characters; there's only one of these sequences per per cell. </p>
  
  <p>Here's what I mean:</p>
  
  <pre><code>dF$newColumn = str_extract_all(string = "dF$column1", pattern ="sequence_1|sequence_2")
  </code></pre>
  
  <p>Am I screwing the syntax up here? Can I pull this sort of thing with stringr? Please rectify my ignorance!</p>