Replacing characters in title & author

Hello there! I'm hoping some of the smart people here can help me. I'm using Calibre portable version, and I just imported a bunch of books that I want to rename & reorganize. However, the import used characters that I don't want in my filenames, for example using a colon in the title. Is there a way to tell calibre to, for example, replace colons with dashes? or semicolons with ampersands for the authors?

Thanks so much!