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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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
'The bass can access the river delta from the ocean. The fishermen, assassin, and their friend are happy on the bank'

preferences:
113.95 ms | 407 KiB | 5 Q