title: Split text based on dot in R
body: <p>I have:</p>
  
  <pre><code>"word1.word2"
  </code></pre>
  
  <p>and I want:</p>
  
  <pre><code>"word1" "word2"
  </code></pre>
  
  <p>I know I have to use <code>strsplit</code> with perl=TRUE, but I can't find the regular expression for a period (to feed to the split argument). </p>