Help for RegEx

AlbatorV · May 2, 2017, 12:34pm

Can I have some help with regex.
I want to cut files like :

\1 must be digits
“ - “ is the separator (space minus space)
\2 must have all characters, but never “ - “ (space minus space)

01 - Toto - Tata.mp3
02 - 666.mp3
03 - Ti-ti Tata.mp3
04 - To-to.mp3
05 - Toto.mp3
06 - Toto Tata.mp3
07 - Toto666Tata.mp3
Toto - Tata.mp3

Leo · May 2, 2017, 1:11pm

I turned on Ignore Extension but you can add the \.mp3 back if you don't want that.

^(\d+) - (?!.* - .*)(.*)$
\2\\\1

AlbatorV · May 3, 2017, 6:56pm

Can you explain (?!.* - .*) please ?

Leo · May 3, 2017, 9:27pm

It's a negative lookahead.