正则表达式捕获剧集编号

Question

What is wrong with the following regular expression I have:

s = "s4, ep2 -- The one"
>>> re.search(r'(Episode|Ep?\.?)?\s?(\d{0,})', s, re.IGNORECASE).group(2)
''

I am trying to capture the 2 from the "S4, Ep2" . I thought the Ep?\\.?\\s?d{0,} would capture it but it seems like I'm missing something.

Here are other example inputs that might be entered:

Episode 2
Ep. 2
E. 2
2
Season 4, E 2 -- Hello

All of the above should come out as "2"

Answer 1

This version is working. We can try matching on Episode , Ep , or just E , followed by an optional dot and/or space. Then, capture an episode number.

s = "s4, ep2 -- The one"
print(re.search(r'(?:Season \d+,\s+)?(?:Episode|Ep|E)?\.?\s?(\d{0,})',
    s, re.IGNORECASE).group(1))

2