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<?php
$str = "dateto:'2015-10-07 15:05' xxxx datefrom:'2015-10-09 15:05' yyyy asdf";
$matches = preg_split('/(?<!\d)(\s)/', $str);
print_r($matches);

Success #stdin #stdout 0.02s 52480KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => dateto:'2015-10-07 15:05'
    [1] => xxxx
    [2] => datefrom:'2015-10-09 15:05'
    [3] => yyyy
    [4] => asdf
)

https://ideone.com/EP06Nt

language:

PHP (php 7.3.5)

created:

visibility:

public

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