Say I have the following data:

house_number<-floor(runif(100, 200, 600))
water_evaluation<-c("No water damage", "Water damage", "Water On", "Water off", 
"water pipes damaged", "leaking water")
water_evaluation_selection<-floor(runif(100, 1,6))
house_info<-data.frame(water_evaluation[water_evaluation_selection],
                       house_number) 

And, that I only want to pull out the ones with negative water evaluations, 
i.e. Water damage, water pipes damaged, and leaking water. 

Should/could I use grep in order to pull the house numbers out of house_info 
with those negative water evaluations?  

I guess I want to know the house numbers from house_info where the water 
evaluation is negative.  Is there a way to use grep or another R function in 
order to acquire that information? 

Thank you again in advance for any insights.

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