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<?php $test = "dark gray squirrel"; $r = "!s.+!"; $r2 = "{s.+}"; $r3 = "~s.+~"; preg_match($r,$test,$matches); var_dump($matches); preg_match($r2,$test,$matches); var_dump($matches); preg_match($r3,$test,$matches); var_dump($matches);
Output for 7.0.0 - 7.0.25, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array(1) { [0]=> string(8) "squirrel" } array(1) { [0]=> string(8) "squirrel" } array(1) { [0]=> string(8) "squirrel" }

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196.2 ms | 404 KiB | 182 Q