Check username on regular characters

This snippet will check the input on regular characters. Allowed: a-z, A-Z, 0-9, underscore(_) and dot(.).

function check_username($name)
{
    $valid = false;
    if (preg_match('/^[a-zA-Z0-9_\-\.]{5,25}$/', $name))
    {
        $valid = true;
    }

    return $valid;
}

Example

if (check_username('MrX-Hell.boy')) echo 'valid!';

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