allow _ in CNAMEs
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@ -53,7 +53,7 @@ def validate_zone_label(value):
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Labels may not be all numbers, but may have a leading digit (e.g., 3com.com).
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Labels must end and begin only with a letter or digit. See [RFC 1035] and [RFC 1123].
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"""
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if not re.match(r'^[a-z0-9][\.\-0-9a-z]*[\.0-9a-z]$', value):
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if not re.match(r'^[a-z0-9][\.\-0-9a-z_]*[\.0-9a-z]$', value):
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msg = _("Labels must start and end with a letter or digit, "
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"and have as interior characters only letters, digits, and hyphen.")
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raise ValidationError(msg)
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