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I don't think the roslaunch XML syntax supports more complex comparisons.

Instead, you could conditionally include a launch file or configuration file with the same name as your mode:

<arg name="mode" default="simulate"/>
<include file="$(find my_package)/launch/modes/$(arg mode).launch"/>
<rosparam command="load" file="$(find my_package)/config/modes/$(arg mode).yaml"/>

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