使用dplyr对多列进行多条件过滤

I've searched on SO trying to find a solution to no avail. So here it is. I have a data frame with many columns, some of which are numerical and should be non-negative. I want to clean the data since some values in these numerical columns are negative. What I can do now is extract the column names of these columns with a regular expression. But I am not sure how to implement the filtering of rows based on these columns. I've searched on SO trying to find a solution t