I found it myself.
Code:
(\[(?P<series>.*)\-(?P<series_index>.*)\]\s*)?((?P<author>.*) -)?\s*(?P<title>.*) ?
It works for :
author - title.mobi
[Serie-1.5]title.mobi
[Serie-1.5]author - title.mobi
But the title is allways replaced by the one found in the metadata Grrrr.
If i don't use metada, i lose all the other tags.
For now, i want to use a custom column : custom_title
But if i use it in my regular expression (?P<custom_title>) nothing happens !
Any idea, please ??