I just ran into an issue with the accepted answer. While the $ work for a normal query. When using it in a dashboard the $123$ is evaluated as a dashboard token rather than a field. For a dashboard you must change it to single quotes. | stats count as 123 | eval abc = round('123', 2)
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It looks like as of at least Splunk Version 7.0.3.4 if you go into Lookups -> Lookup definitions and select the "Advanced options" checkbox there's now a Match type field. I just added "WILDCARD(fieldname)" there and it worked.
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