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@ 2020-02-27T10:34:45Z

<?php

$string = 'REGISTER 11223344 here';

var_export(
    preg_replace('/(?<=REGISTER )(.*)(?= here)/','',$string)
);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

67.47 ms | 402 KiB | 5 Q