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<?php $text = "Hello, Mr. James. How are you today."; var_export( preg_split('~(?:Mrs?|Miss|Ms|Prof|Rev|Col|Dr)[.?!:](*SKIP)(*F)|[.?!:]+\K\s+~', $text, 0, PREG_SPLIT_NO_EMPTY) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => 'Hello, Mr. James.', 1 => 'How are you today.', )

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