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@ 2020-03-12T07:14:51Z

<?php

$mystring = 'JS35BX54NV33';
var_export(preg_replace('/(?<=\D)(?=\d)|(?<=\d)(?=\D)/', ' ', $mystring));

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

55.18 ms | 1516 KiB | 5 Q