Filter rows which contain a certain string

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I have to filter a data frame using as criterion those row in which is contained the string RTB.

I’m using dplyr.

d.del <- df %>%
  group_by(TrackingPixel) %>%
  summarise(MonthDelivery = as.integer(sum(Revenue))) %>%
  arrange(desc(MonthDelivery))

I know I can use the function filter in dplyr but I don’t exactly how to tell it to check for the content of a string.

In particular I want to check the content in the column TrackingPixel. If the string contains the label RTB I want to remove the row from the result.

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