Hi David; Yes you can if you create a script. Have a look at http://commons.apache.org/proper/commons-jexl/apidocs/org/apache/commons/jexl3/JexlScript.html#getVariables . Many examples in https://github.com/apache/commons-jexl/blob/trunk/src/test/java/org/apache/commons/jexl3/VarTest.java Cheers.
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