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@ 2019-11-14T17:33:30Z

<?php

echo preg_match('/Я/ui', 'я');
echo preg_match('/(?=Я)/ui', 'я');
echo preg_match('/Л/ui', 'л');
echo preg_match('/(?=Л)/ui', 'л');

Output
Performance
VLD
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preg_match: documentation ( source)

preferences:dark modelive preview

67.18 ms | 402 KiB | 5 Q