I have a dashboard panel with a table. I am able to change the drilldown search when selecting a row in the panel table to open a new window with the new search: <search> <query>index=$Environment$ ( program=*shot_director OR program=cryo_director* ) shot_Id=$shotIdPattern$ "Commanded|GoToState" | sort _time | table _time,program,shot_Id,slc_State</query> <earliest>$shotEarliest$</earliest> </search> <drilldown> <link target="_blank"> /app/search/search?q=search index=$Environment$ "&lt;macro_step_complete&gt;" "Execution of Macro Step " shot_id=$shotIdPattern$ | eval subsystem=shot_supervisor | sort -_time </link> </drilldown> but when I add the regex | rex field=taxon (?<ss>[^|]*)[|] creating /app/search/search?q=search index=$Environment$ "&lt;macro_step_complete&gt;" "Execution of Macro Step " shot_id=$shotIdPattern$ | rex field=taxon (?&lt;ss&gt;[^|]*)[|] | eval subsystem=shot_supervisor | sort -_time the search window created results in: index=iccs_int "<macro_step_complete>" "Execution of Macro Step " shot_id=N160613-003* | rex field=taxon ( in the search box and the error Error in 'rex' command: Encountered the following error while compiling the regex '(': Regex: missing ) It seems the "?" in the regex is being consumed before it is being sent to the search app. Any ideas? Thanks in advance! ... View more