Regular expressions use a formalized syntax to achieve complex find and replace operations by matching specified patterns of text. The DF Studio Rename Images tool allows the use of regular expressions to replace text in the filenames of assets.
Understanding and composing regular expression patterns can be challenging, but they provide an opportunity to automate solutions that might otherwise require a great deal of manual effort. For an example workflow that uses regular expressions to rename multiple files, see Rename and Renumber Assets.
There are many resources available online for learning about regular expressions. The following tools provide opportunities to test and learn the proper syntax: