Select string by position and length

[frankdarwin]

Hello,
I would like to rename files with the Renamer.
I want to append DateTimeOriginal to the original name. But I don't want to take DateTimeOriginal as it is represented in the metadata (DD.MM.YYYY:HH:MM), but in the form YYMMDD.
I know from different programming languages that you can select characters of a string based on their position and length.
I have also already searched on https://www.regular-expressions.info/, but unfortunately found nothing.
Can someone help me here?
Many thanks in advance.

[thrinn]

No need to use RegExp for this common task. You can use the format function to specify how the result should be formatted. E.g.

Code Select Expand

{File.DateTime|format:YYMMDD}
See also Date and Time Format. The whole Variables topic in the help has a lot of examples because variables are really flexible and powerful to use.