import re

def getEpisode(filename):
    return re.search(r"\b(?:e(?:p(?:isode)?)?|x)?\s*(\d{2,3})\b", filename, re.IGNORECASE)

episodes = [
    "Terkel in Trouble 2004",
    "eisode11",
    "episode12",
    "e13",
    "ep14",
    "EP999 this is x888",
    "  234",
    "235"
]
for episode in episodes:
    match = getEpisode(episode)
    if match:
        print(match.group(1))