allowing for _ in domains
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@ -35,7 +35,7 @@ def is_valid_domain(domain):
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domain = domain[:-1]
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if len(domain) > 253:
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return False
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fqdn_re = re.compile("(?=^.{1,63}$)(^(?:[a-z0-9](?:-*[a-z0-9])+)$|^[a-z0-9]$)", re.IGNORECASE)
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fqdn_re = re.compile("(?=^.{1,63}$)(^(?:[a-z0-9_](?:-*[a-z0-9_])+)$|^[a-z0-9]$)", re.IGNORECASE)
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return all(fqdn_re.match(d) for d in domain.split("."))
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