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@ 2019-12-18T17:16:12Z

<?php

if (!preg_match('#^[a-zA-Z]+[a-zA-Z0-9_]*$#', 'jkahsdk'))
{
    echo 'error';
}
else
{
    echo 'ok';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

42.32 ms | 1445 KiB | 5 Q