13.3.3 Replacing substrings using str_replace().13.3.2 Locating a pattern using str_locate().13.3.1 Detecting a pattern using str_detect().13.2.3 Extracting substrings with str_sub().
13.2.1 Concatenating with str_c() or str_join().7.1 Classical functions for summarizing rows and columns.2.2 Scalar Functions Applied to Vectors.
