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@ 2019-10-17T14:18:27Z

<?php

$strings = [
    "quanity*price/2+tax",
    "quanity*price/2"
];

foreach ($strings as $string) {
    $keywords = preg_split("~[-*/+\d]+~", $string,  -1, PREG_SPLIT_NO_EMPTY);
    print_r($keywords);
}

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
preg_split: documentation ( source)

preferences:dark modelive previewkey bindings

33.55 ms | 405 KiB | 5 Q