title: Split character string by forward slash or nothing
body: <p>I want to split this vector </p>
  
  <pre><code>c("CC", "C/C")
  </code></pre>
  
  <p>to </p>
  
  <pre><code>[[1]]
  [1] "C" "C"
  
  [[2]]
  [1] "C" "C"
  </code></pre>
  
  <p>My final data should look like:</p>
  
  <pre><code>c("C_C", "C_C")
  </code></pre>
  
  <p>Thus, I need some <code>regex</code>, but don't found how to solve the "non-space" part:</p>
  
  <pre><code>strsplit(c("CC", "C/C"),"|/")
  </code></pre>