import re
from unidecode import unidecode

def extract_video_id(url: str) -> str:
    match = re.search(r"(?:v=|youtu\.be/)([A-Za-z0-9_-]{11})", url)

    if not match:
        raise ValueError("URL inválida do YouTube")
    return match.group(1)

def sanitize_title(s: str) -> str:
    s = unidecode(s or "video")
    s = re.sub(r"[^\w\s-]", "", s).strip()

    return re.sub(r"_+", "_", re.sub(r"\s+", "_", s)) or "video"