Regular Expressions

Common regexes

purpose/match/validates	Regex
FQDN[(fully qualified domain name)][(from http://blog.gnukai.com/2010/06/fqdn-regular-expression/ which references RFC1035)]	`(?=^.{1,254}$)(^(?:(?!\d\|-)[a-zA-Z0-9\-]{1,63}(?<!-)\.?)+(?:[a-zA-Z]{2,})$)`