title: regex to find all text after delimited string
body: <p>I have some content that contains a token string in the form</p>
  
  <pre><code>$string_text = '[widget_abc]This is some text. This is some text, etc...';
  </code></pre>
  
  <p>And I want to pull all the text after the first ']' character</p>
  
  <p>So the returned value I'm looking for in this example is:</p>
  
  <pre><code>This is some text. This is some text, etc...
  </code></pre>