title: Regex (PHP) insert a space after letter combination Using Search Regex Wordpress Plugin
body: <p>Firstly, I hate to be a pain but I'd like to know how to specifically do this in the Search Regex WordPress plugin. It's a popular plugin, but I don't understand how the Replace pattern works for it, it suggests that it accepts regex, but ends up just using literals.</p>
  
  <p>How can I use a replace pattern to insert a space after a certain set of letters. I have the search pattern sorted, just need to know how to replace with a space.</p>
  
  <p>So if we supposed I had a search that looked for every instance where 'testing' was followed by a few letters and I wanted to put a space after each instance.</p>
  
  <p>e.g.</p>
  
  <pre><code>testingstring
  </code></pre>
  
  <p>should be replaced with...</p>
  
  <pre><code>testing string
  </code></pre>