title: Search a column to match data in another column and count the number of occurences
body: <p>I've searched the web but I can't find anything specific for this.</p>
  
  <p>I have column A as below, I need to search this column and find out how many occurrences there are of the data in column B, in the example below there a 4 (70011x3 + 70014x1).</p>
  
  <pre><code>A                        B
  h323:70011               70011
  70007                    70012
  70011                    70013
  h323:70014               70014
  sip:70011@domain.com     70015
  </code></pre>
  
  <p>What formula would I need to use in Excel?
  Thanks in advance</p>