[DMcCunney]

Originally Posted by theducks

Bulk mode Search and replace in REGEX mode will do this

Thank you. I was assuming a regex search and replace if I exported and used an OS level utility.

BACKUP YOUR LIBRARY,

Since the library is hundreds of GB, that will be a process. I have a TB drive in an external enclosure I can use to do it.

this will rename all those book files (title folders)and can take a bit of time, have the computer running from the mains if battery powered.

Calibre and its library live on an always on 3.1ghz HP desktop running Win10 Pro, connected to mains power.

I understand about time: when I asked Calibre to convert from PDB to ePub, it took a while, and I watched my CPU peg at 100% usage as multiple Calibre worker processes were involved.

Here you go
The optional space between the prefix and title is handled with the \s*

Noted for future reference. This is something I would set up, start running, and go to bed, and look at results in the morning.

Thanks again.
______
Dennis