How to use preg_match to search json string?

Question

PHP

if (!preg_match('/'.str_replace('"', '', json_encode($s)).'/', $out)) {
                   ...
                }

It is necessary to check the absence of a substring in json format in a string. This code gives an error:

Compilation failed: PCRE does not support \L, \l, \N, \U, or \u

Tell me how to fix it?

Answer 1

Do you have it?
Or do you need to know if there is one array in json or more?
What does it mean: the absence of a substring in json format in a string ?