'DBFit: How to assert against regular expression

I am trying to assert the output of a stored procedure against a regular expression. Consider the following example:

!|Execute Procedure|CONCAT_ERROR_MESSAGES|
|x_error_message   |l_error_message_in        |x_error_message?        |
|hello!-||-!       |!-||-!world               |=~/world/               |

The FitNesse docs say it is possible using the slim engine. DBFit is using Fit and I can't find much related to this.

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http://fitnesse.org/FitNesse.UserGuide.WritingAcceptanceTests.SliM.ValueComparisons

Any help would be greatly appreciated.

Thanks



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