# rem_trk99.py

# -*- coding: utf-8 -*- ### <<< required @ first line
# rem_trk99.py + proper titlecasing

import os, re

def solve(s):
    name, ext = os.path.splitext(s)
    name = name.replace('_',' ')
    if ' - ' not in name: name = name.replace('-',' - ')
    v='[\[|\(|\{|+|#]?\d{1,2}[\.|:|\]|\)|\}| -]+'
    name = re.sub('^.?'+v+'[ ]?', '', name)
    name = re.sub(' - '+v, ' - ', name)

    ### To have both [ A.B.C. ] and [ It'll ]
    return re.sub(r"[A-Za-z]+('[A-Za-z]+)?",
            lambda mo: mo.group(0)[0].upper() +
            mo.group(0)[1:].lower(), name)

print solve("DJ 99 - It'll be The Music_ Ft_ The A.B.C. and Artiste.mp3")
print solve("05-dj_99-it'll_be_the_music-remix.mp3")
print solve("05 - dj 99 - it'll be the music - remix.mp3")
print solve("#5 - dj 99 - it'll be the music - remix.mp3")
print solve("5.) dj 99 - it'll be the music - remix.mp3")
print solve(" [5] dj 99 - it'll be the music - remix.mp3")
print solve("{5} dj 99 - it'll be the music - remix.mp3")
print solve("[05] dj 99 - it'll be the music - remix.mp3")
print solve("05: dj 99 - it'll be the music - remix.mp3")
print solve("100 - dj 99 - it'll be the music - remix.mp3")
print solve("dj 99 - 05 - it'll be the music - remix.mp3")