Rename

You can use the evaluator in the advanced rename tool to insert text returned by the evaluation.

Use the {= ... =} code to insert an evaluation expression. The return value of the expression is inserted into the new filename.

In this evaluation context, the following variables are available:

Variable	Type	Description
column name	varies	All the column keywords are available as variables in this evaluation context. Note that some keywords may use characters like a : that aren't valid in variable names - to access them, use the val function. Additionally, the rename-specific keywords like parent and parentbase are supported.
file_name	string	Returns the full name of the file the expression is being run for. This may be different from file which (as a column keyword), returns the value of the Name column (which e.g. may have file extensions hidden).
is_dir	bool	True if the expression is being run for a folder, false if it's being run for a file.
oldname	str	The value of the "old name" field.
newname	str	The value of the "new name" field.

The return value should be a str that will be inserted into the new filename.