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Need help? Display domain name

P: 1
Can any one kindly post a solution.

I want to use php to display the domain name typed in by the user. Parse it to display in the desired format. This result will be checked against a database and relevant content is displayed.


Visitor types in This will be parsed into and then matched against a mysql database entry and then display content accordingly.

I appreciate your help. Thanks.
May 7 '07 #1
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Expert 5K+
P: 5,821
Off the top of my head, you could probably do something like this:
[EDIT: Please don't do it off the top of my head; a desk would be much more comfortable for both of us.]

if(preg_match('/([-\w_]+(?:\.\w{2,4})+)(?=(\/|$))/', $_REQUEST['domain'], $matches)) {

This will match any alphanumeric or hyphen/underscore characters, then any series of subdomains (alphanumeric only, 2-4 chars), immediately preceding either the first '/' character, or the end of the string.

This matches stuff like '', '', '', but admittedly it also matches '------------------------------------.mug', so you might have to do a little extra validation.

[EDIT: Incidentally, $matches has three elements after running this regex on my system, but it should only have one. Apparently, the PCRE engine in PHP 5.2.1 (or at least the one I compiled on my Mac) does not properly support non-capturing parenthesis nor lookaheads properly.]
May 8 '07 #2

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