i just want to change the title so they are the same as filename

[ohrenkino]

@BogusAurelius

....but i don't understand where to put those expressions ( in the title presumably?) but not sure.

I don't understand why you don't simply follow the instructions.
I refer to the functions of the converter. I said nothing about regular expressions.
I would say that it is now time to have a look at the Frequently Asked Questions:
/t/8016/1

BTW: the current version of MP3tag is 2.84 - you have 7.0 in your signature. Are we talking about the same program?