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Using regex in python to get episode numbers from file name
def getEpisode(filename):
    matches = re.findall(r"e[0-9][0-9]", filename)
    if len(matches) == 1:
        episode = matches[0]
        episode = stripEp(episode)
        return episode
    else:
        return False

def stripEp(target):
    target = target.strip()
    target = target.strip('abcdefghijklmnopqrstuvwxyz.')
    return target

matches = re.findall(r"(e[0-9][0-9]|E[0-9][0-9]|x[0-9][0-9]|X[0-9][0-9]|episode [0-9][0-9]|Episode [0-9][0-9]|n[0-9][0-9])", filename)

Series Name s01e01.avi

Series Name 1x01.avi

Series Name episode 01.avi

01 Episode Title.avi

def getEpisode(filename):
    match = re.search(
        r'''(?ix)                 # Ignore case (i), and use verbose regex (x)
        (?:                       # non-grouping pattern
          e|x|episode|^           # e or x or episode or start of a line
          )                       # end non-grouping pattern
        s*                       # 0-or-more whitespaces
        (d{2})                   # exactly 2 digits
        ''', filename)
    if match:
        return match.group(1)

tests = (
    'Series Name s01e01.avi',
    'Series Name 1x01.avi',
    'Series Name episode 01.avi',
    '01 Episode Title.avi'
    )
for filename in tests:
    print(getEpisode(filename))

01
01
01
01

re.findall(r"(?:e|x|episode|n)(d{2})", filename, re.I)

re.findall(r"(?:s|season)(d{2})(?:e|x|episode|n)(d{2})", filename, re.I)