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<?php $str = 'Heading: This is a string. Very exciting! What do you think? ...one more thing, this is cool.'; var_export( preg_split('~[.?!:]+\K\s+~', $str, 0, PREG_SPLIT_NO_EMPTY) );
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
array ( 0 => 'Heading:', 1 => 'This is a string.', 2 => 'Very exciting!', 3 => 'What do you think?', 4 => '...one more thing, this is cool.', )

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