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Learning Shiny
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grep()
in R works exactly as it does in every UNIX-based operating system. Closely related to grep()
(in fact, R groups them together and treats them as a group of functions), various other functions can be found. In this section, only grepl()
, gregexpr()
, and gsub()
will be examined. One thing that all these functions have in common is that they perform an action based on a string pattern. The description of the functions are as follows:
grep()
: This returns the indexes of the elements in a vector that match a string pattern. If the value is set to TRUE
, it returns the values instead of the indexes.
grepl()
: This returns a logical vector of the same length as the input vector, denoting whether the sought pattern was found or not.
gsub()
: This substitutes the pattern for the replacement argument in the specified vector.
gregexpr()
: This returns a list consisting of the vectors of starting positions that specify where the pattern was matched in the text in addition...
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