What is a Regular Expression?

The DF Studio Rename Images tool allows using regular expressions, a powerful pattern matching and replacement system.

Regular expressions are not for the faint of heart as they can be quite complicated, but they provide a way to accomplish complex find and replace operations that are not possible otherwise. (See this useful example of renumbering images in DF Studio using a regular expression)

There are many resources available online for both learning about and testing regular expressions. Here are two tools that provide an easy way to test and learn:

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