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@ 2020-09-10T22:41:07Z

<?php

$pattern1 = '/^[0-9_\p{L}\p{Cyrillic}]+$/u';

var_dump(preg_match($pattern1, 's'));
var_dump(preg_match($pattern1, 'S'));

# https://regex101.com/r/F5JvPD/1

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

66.25 ms | 402 KiB | 5 Q