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<?php preg_match('/^[^.]*\.(?=\w+\.\w+$)/','subdomain.example.com',$matches); $subdomain = isset($matches[0]) ? trim($matches[0],'.') : ''; echo $subdomain;
Output for git.master, git.master_jit
Warning: Module "Zend OPcache" is already loaded in Unknown on line 0 Warning: Zend OPcache: module registration failed! in Unknown on line 0 subdomain
Output for rfc.property-hooks
subdomain

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