The Step Actual Results field applies to Script Assignment entities and allows searching across actual result values recorded for any steps in the run.
Within the contains/does not contains value for the "StepActualResults" field, you can use Lucene query parser syntax - including * and ? wildcards.
See the Lucene Query Parser documentation for more information.
To find all Script assignments where the step actual results field contains "link broken", write the following query:
StepActualResults ~ "link broken"
~, !~, IS, IS NOT