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docs: refine client_attrs doc

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zmstone 2024-04-16 08:31:07 +02:00
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rel/i18n/emqx_schema.hocon
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@ -1587,9 +1587,9 @@ client_attrs_init_expression {
label: "Client Attribute Extraction Regular Expression" label: "Client Attribute Extraction Regular Expression"
desc: """~ desc: """~
A one line expression to evaluate a set of predefined string functions (like in the rule engine SQL statements). A one line expression to evaluate a set of predefined string functions (like in the rule engine SQL statements).
The expression accepts direct variable reference, or one function call with nested calls for its arguments, The expression can be a function call with nested calls as its arguments, or direct variable reference.
but it does not provide variable binding or user-defined functions and pre-bound variables. So far, it does not provide user-defined variable binding (like `var a=1`) or user-defined functions.
For example, to extract the prefix of client ID delimited by a dot: `nth(1, tokens(clientid, '.'))`. As an example, to extract the prefix of client ID delimited by a dot: `nth(1, tokens(clientid, '.'))`.
The variables pre-bound variables are: The variables pre-bound variables are:
- `cn`: Client's TLS certificate common name. - `cn`: Client's TLS certificate common name.