title: How to get substring from 4th occurence of a character until the end of given string in PSQL
body: <p>Example</p>
  
  <p>I have a string...</p>
  
  <p>'/this/is/a/given/string/test.file'.</p>
  
  <p>How can I get substring 'given/string/test.file' in PSQL?</p>
  
  <p>Thank you!</p>