title: How do I check if a cell only contains characters from a specific list?
body: <p>I'm trying to do a check on a data column to see if its rows only contain specific characters. The characters in question are <code>0</code>-<code>9</code> and <code>/</code>. If only those are present, an <code>OK</code> should be returned, otherwise an error (or 1 and 0, anything distinguishable is fine). It should basically look like this (bold column):</p>
  
  <p><img src="https://i.stack.imgur.com/xMnGh.png" alt="https://i.imgur.com/IrJuZ47.png"></p>
  
  <p>I had limited success with MATCH and VLOOKUP but nothing that employs a range. A formula would be preferred but VBA's cool too. Any ideas?</p>