selecting vars with `starts_with`, `ends_with`, `contains` and `matches` return wrong result when given pattern does not exist · Issue #498 · tidyverse/dplyr · GitHub
Using starts_with() on a grouped dataframe adds the grouping column name to the output · Issue #5987 · tidyverse/dplyr · GitHub
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Select Data Frame Columns by Logical Condition in R (Example) | grepl, select & starts_with of dplyr - YouTube
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