How to import multiple .csv files at once?

rr-faq
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Select the row with the maximum value in each group

rr-faqdataframe
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How do I deal with special characters like \^$.?*|+()[{ in my regex?

rr-faqregex
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Filter data.frame rows by a logical condition

rr-faqdataframesubset
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Count number of rows within each group

rr-faqdataframeaggregate
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