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<?php $string = "The bass can access the river's delta from the ocean. The fishermen, assassins, and their friends are happy on the banks"; var_export(preg_replace("~'?(?<!s)s\b~", '', $string));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
'The bass can access the river delta from the ocean. The fishermen, assassin, and their friend are happy on the bank'

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147.01 ms | 402 KiB | 123 Q