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<?php $pat = ',(?P<controller>[[:alnum:]]+)/(?P<action>[[:alnum:]]+)/(?P<vvv>[[:alnum:]]+),'; $str = 'controller1/action1/fff'; preg_match_all($pat, $str, $matches); print_r($matches);
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => Array ( [0] => controller1/action1/fff ) [controller] => Array ( [0] => controller1 ) [1] => Array ( [0] => controller1 ) [action] => Array ( [0] => action1 ) [2] => Array ( [0] => action1 ) [vvv] => Array ( [0] => fff ) [3] => Array ( [0] => fff ) )
Output for 4.3.0 - 4.3.2
Array ( [0] => Array ( [0] => controller1/action1/fff ) [1] => Array ( [0] => controller1 ) [2] => Array ( [0] => action1 ) [3] => Array ( [0] => fff ) )

preferences:
225.54 ms | 401 KiB | 354 Q