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<?php $str = "immediate! availability. of PHP 5.3.29.a"; var_export( preg_split('/[!.]\K ?(?=[a-z])/i', $str) );
Output for git.master_jit, git.master, rfc.property-hooks
array ( 0 => 'immediate!', 1 => 'availability.', 2 => 'of PHP 5.3.29.', 3 => 'a', )

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