hostnameRegexStringRFC1123=`^[a-zA-Z0-9][a-zA-Z0-9\-\.]+[a-zA-Z0-9]$`// accepts hostname starting with a digit https://tools.ietf.org/html/rfc1123
hostnameRegexStringRFC1123=`^([a-zA-Z0-9]{1}[a-zA-Z0-9_-]{0,62}){1}(\.[a-zA-Z0-9_]{1}[a-zA-Z0-9_-]{0,62})*?$`// accepts hostname starting with a digit https://tools.ietf.org/html/rfc1123