The issue arises because the regex captures additional characters

import re

fullText = "Belgium+32 483 38 63 [email protected]"
EMAIL_REGEX = r"\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,4}\b"

worker = re.findall(EMAIL_REGEX, fullText)
print(worker)