[GitHub] [camel-quarkus] gansheer opened a new issue, #5217: Add documentation on usage of Camel simple expression in configuring property

["gansheer (via GitHub)" <gi...@apache.org>]

gansheer opened a new issue, #5217:
URL: https://github.com/apache/camel-quarkus/issues/5217

   ### Description
   
   The documentation lack some explanation on how to use a [Camel Simple Expression](https://camel.apache.org/components/4.0.x/languages/simple-language.html) in a configuration property in the `application.properties` file.
    
   Adding a section in the [user guide](https://github.com/apache/camel-quarkus/blob/main/docs/modules/ROOT/pages/user-guide/configuration.adoc) to  using a config property for a Camel simple expression and explaining that expressions like `${body}` need special treatment (E.g using the raw value) would be very helpful.
   
   As an example:
   * this is a valid expression embedded as a parameter in the route: `expression: "${body} contains 'not_in'"`
   * this is the same valid expression as a property: `myexpression=\\${body} contains 'not_in'`
   
   
   Note: this is a follow up of this [discussion on zulip](https://camel.zulipchat.com/#narrow/stream/257302-camel-quarkus/topic/.E2.9C.94.20Kamelet.20simple-filter-action.20configuration).


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