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import re
from typing import Optional
def sub_clyde(username: Optional[str]) -> Optional[str]:
"""
Replace "e"/"E" in any "clyde" in `username` with a Cyrillic "е"/"E" and return the new string.
Discord disallows "clyde" anywhere in the username for webhooks. It will return a 400.
Return None only if `username` is None.
"""
def replace_e(match: re.Match) -> str:
char = "е" if match[2] == "e" else "Е"
return match[1] + char
if username:
return re.sub(r"(clyd)(e)", replace_e, username, flags=re.I)
else:
return username # Empty string or None
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