title: grep string including forward slash as part of word
body: <p>How to treat <code>/</code> as part of word and grep exact match?</p>
  
  <pre><code>$ echo "aa/bb/cc dd/ee/ff" | grep -w aa/bb
  aa/bb/cc dd/ee/ff
  $ 
  </code></pre>
  
  <p>I want grep to match the whole string without exception to <code>/</code>.
  In the above example, I don't want it to match <code>aa/bb/cc</code> string, but match only if there is any <code>aa/bb</code></p>
  
  <p>Expected outputs:</p>
  
  <pre><code>$ echo "aa/bb/cc dd/ee/ff" | grep &lt;options??&gt; aa/bb
  $ &lt;empty&gt;
  $ echo "aa/bb dd/ee/ff" | grep &lt;options??&gt; aa/bb
  aa/bb dd/ee/ff
  $ echo "kk/ll aa/bb dd/ee/ff" | grep &lt;options??&gt; aa/bb
  kk/ll aa/bb dd/ee/ff
  $ echo "kk/ll dd/ee/ff aa/bb" | grep &lt;options??&gt; aa/bb
  kk/ll dd/ee/ff aa/bb    
  $ echo "kk/ll dd/ee/ff aa/bb/cc" | grep &lt;options??&gt; aa/bb
  $ &lt;empty&gt;
  $ echo "kk/ll dd/ee/ff a-aa/bb" | grep &lt;options??&gt; aa/bb
  $ &lt;empty&gt;
  </code></pre>