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run code in 150+ php & hhvm versions
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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 4.3.10 - 4.4.9, 5.0.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Europe/London => Europe/London America/New_York => York America/Costa_Rica => Rica
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/OkrYv on line 10 Europe/London => Europe/LondonPHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/OkrYv on line 10 America/New_York => YorkPHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/OkrYv on line 10 America/Costa_Rica => RicaPHP_EOL