Php regular expression matches the domain name in the URL

Php regular expression matches the domain name in the URL

$ Search = '~ ^ ([^ :/? #] + ):)? (// ([^ /? #] *)? ([^? #] *) (\? ([^ #] *)? (#(.*))?~ I '; $ Url = 'http: // www.php.net/pub/ietf/uri/#related '; $ Url = trim ($ url ); Preg_match_all ($ search, $ url, $ rr ); Printf (" The output URL data is: %s \ N ", var_export ($ rr, TRUE )); /* The groups are as follows: $1 = http: $2 = http $3 = // www.php.net $4 = www.php.net $5 =/pub/ietf/uri/ $6 = $7 = $8 = # Related $9 = Related */ ?> Here we provide another concise code: // Obtain the host name from the URL Preg_match ("/^ (http :\/\/)? ([^ \/] +)/I "," http://www.php.net/index.html ", $ matches ); $ Host = $ matches [2]; // Obtain the following two segments from the host name Preg_match ("/[^ \. \/] + \. [^ \. \/] + $/", $ host, $ matches ); Echo "domain name is: {$ matches [0]} \ n "; ?> Output after execution: domain name is: php.net