Regular expressions (or Regex's) are a way of defining patterns to look for. They make it easy to define an exact series of letters and numbers to look for (such as for client ID's or Employee numbers).
For more information on Regex:
- This is a useful cheat sheet: https://cheatography.com/davechild/cheat-sheets/regular-expressions/
- And you can test them here: https://regex101.com/
Please view at your own risk. We cannot be held responsible for 3rd party site content.