Can you use an expression as a regex?

Question

Can you use an expression as a case condition? Take, for example, the following code:

<switch description="Path based on the output" source="$body/output">
    <case regex="A|B">
        <call description="Send request to endpoint">
            <endpoint key="endpoint"/>
        </call>
    </case>
    <default/>
</switch>

This works and will send the message to the endpoint if the $body/output evaluates to either A or B.

Is it possible to store the "A|B" somewhere else (for example in an local-entry called "output.xml"), and use an expression in the case regex instead? For example:

    <case regex="get-property('output')">

If that's not possible and the case regex has to evaluate to a String, is it possible to store the contents of the local-entry in the sequence to I call upon them in the case regex, or does the case regex have to be "A|B"?

Answer 1

AKAIK you can only have a Regex string in the case. The code also confirms this where it seems to store the regex string as a java.util.regex.Pattern and uses java.util.regex.Matcher to match it against the source. So simply you have to have A|B or any other valid regex for the matcher to work.