ClickHouse/tests/integration/test_password_constraints/configs/complexity_rules.xml

<clickhouse>
    <password_complexity>
        <rule>
            <pattern>.{12}</pattern>
            <message>be at least 12 characters long</message>
        </rule>
        <rule>
            <pattern>\p{N}</pattern>
            <message>contain at least 1 numeric character</message>
        </rule>
        <rule>
            <pattern>\p{Ll}</pattern>
            <message>contain at least 1 lowercase character</message>
        </rule>
        <rule>
            <pattern>\p{Lu}</pattern>
            <message>contain at least 1 uppercase character</message>
        </rule>
        <rule>
            <pattern>[^\p{L}\p{N}]</pattern>
            <message>contain at least 1 special character</message>
        </rule>
    </password_complexity>
</clickhouse>