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<?php $txt = 'Lot99. Is it 1+3 or 5 or 6.53'; var_export( preg_split('~(?:\d+\.\d+|\w+|\S)\K *~', $txt, 0, PREG_SPLIT_NO_EMPTY) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'Lot99', 1 => '.', 2 => 'Is', 3 => 'it', 4 => '1', 5 => '+', 6 => '3', 7 => 'or', 8 => '5', 9 => 'or', 10 => '6.53', )

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