If, by regression file, you mean things created by :regression, then you dont. It is presumed to be a complete conversation and all variables come via that conversation without variance. If, instead, you mean to use sample inputs to validate a pattern, then you can assign values on the sample input, like
Sorry, I wasn’t very clear. I meant in the :source file that I use to create the regression file. I found that I could do what I wanted by putting :do $variable=value
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