Change 20230409_150627.mp4 to 2023-04-09_15-06-27.mp4
Search for: (\d{4})(\d{2})(\d{2})_(\d{2})(\d{2})(\d{2})(.*)
Replace: $1-$2-$3_$4-$5-$6$7
\d Dezimalzeichen
{2} genau zweimal
() lässt sich mit $ referenzieren
https://www.ghisler.ch/wiki/index.php/Regular_Expressions
https://helgeklein.com/blog/renaming-multiple-files-with-regular-expressions-in-total-commander/
