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@ 2023-05-03T08:42:50Z

<?php

$tests = [
    '7hello',
    'Fooey',
    'Shoo3y',
    'Whoa!',
    'A1_B2_C3_',
    '_ABC',
    'UB40',
    'omg',
    'Hi_',
    'Stackoverflow_',
];

foreach ($tests as $test) {
    printf(
        "%s : %s\n",
        $test,
        preg_match('/^(?:[a-z]\w*){3}$/i', $test)
            ? 'pass'
            : 'fail'
    );
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
printf: documentation ( source)

preferences:dark modelive previewkey bindings

44.13 ms | 1123 KiB | 5 Q