wwfc_barmy_army Posted June 7, 2009 Share Posted June 7, 2009 Hello. I currently use this to check if they have submitted a valid domain: preg_match ("/^[a-z0-9][a-z0-9\-]+[a-z0-9](\.[a-z]{2,4})+$/i", $domain) Works for example google.com but not for example mail.google.com. So if there an easy way to accept subdomains too? Thanks. Quote Link to comment Share on other sites More sharing options...
rivan Posted June 7, 2009 Share Posted June 7, 2009 preg_match ("/^[a-z0-9][a-z0-9\-]+[a-z0-9](\.[a-z0-9][a-z0-9\-]+[a-z0-9])*(\.[a-z]{2,4})+$/i", $domain) (added first part repeated 0 or more times with dot in front of it) Regards Quote Link to comment Share on other sites More sharing options...
byte1918 Posted June 7, 2009 Share Posted June 7, 2009 Hello. I currently use this to check if they have submitted a valid domain: preg_match ("/^[a-z0-9][a-z0-9\-]+[a-z0-9](\.[a-z]{2,4})+$/i", $domain) Works for example google.com but not for example mail.google.com. So if there an easy way to accept subdomains too? Thanks. i think the problem is that in "mail.google.com" you encounter "." (dot) two times , while your regex is set to check domains which have only one dot. I'm kinda newbie with regular expressions but I will try to make one which works. edit : ah..I hadn't refreshed page, it seems someone has answered your question. sry for useless post. Quote Link to comment Share on other sites More sharing options...
byte1918 Posted June 7, 2009 Share Posted June 7, 2009 Hello. I currently use this to check if they have submitted a valid domain: preg_match ("/^[a-z0-9][a-z0-9\-]+[a-z0-9](\.[a-z]{2,4})+$/i", $domain) Works for example google.com but not for example mail.google.com. So if there an easy way to accept subdomains too? Thanks. I modified rivan regex to: preg_match ("/^[a-z0-9][a-z0-9]*[\-]?+[a-z0-9]*(\.[a-z0-9][a-z0-9\-]+[a-z0-9])*(\.[a-z]{2,4})+$/i", $domain) -because his regex wouldn't match domains starting with one letter before the first dot. (eg. a.google.com) Quote Link to comment Share on other sites More sharing options...
wwfc_barmy_army Posted June 7, 2009 Author Share Posted June 7, 2009 Thanks guys. byte1918's suggestion worked perfectly. Quote Link to comment Share on other sites More sharing options...
Daniel0 Posted June 7, 2009 Share Posted June 7, 2009 Museum is a valid TLD. Just saying. There is also a great deal of valid characters you've missed. Safest thing would probably be to check if there are valid DNS records for a given domain name. If there is then it's obviously valid. checkdnsrr Quote Link to comment Share on other sites More sharing options...
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