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<?php $tzs = array( 'Europe/London', 'America/New_York', 'America/Costa_Rica', ); foreach ( $tzs as $tz ) { preg_match('/([[:alpha:]\/]{3,30})(?!.*([[:alpha:]\/]{3,30}))/', $tz, $match); echo $tz . ' => ' . $match[0] . PHP_EOL; }
Output for git.master, git.master_jit, rfc.property-hooks
Europe/London => Europe/London America/New_York => York America/Costa_Rica => Rica

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