title: Escaped Periods In R Regular Expressions
body: <p>Unless I am missing something, this regex seems pretty straightforward:</p>
  
  <pre><code>grepl("Processor\.[0-9]+\..*Processor\.Time", names(web02))
  </code></pre>
  
  <p>However, it doesn't like the escaped periods, <code>\.</code> for which my intent is to be a literal period:</p>
  
  <pre><code>Error: '\.' is an unrecognized escape in character string starting "Processor\."
  </code></pre>
  
  <p>What am I misunderstanding about this regex syntax?</p>