l6-a15

1. The call grep(pattern,x) searches for a specified substring pattern in a vector x of strings.

grep("Pole",c("Equator","North Pole","South Pole")) 

## [1] 2 3

grep("pole",c("Equator","North Pole","South Pole")) #case sensative

## integer(0)

2. ‘nchar(x)’ finds the length of a string x

nchar("South Pole")

## [1] 10

3. ‘paste(…)’ concatenates several strings, returning the result in one long string

paste("Final","Exam")

## [1] "Final Exam"

paste("Final","Exam",sep="") #no space in between 

## [1] "FinalExam"

paste("Final","Exam",sep=".") #dot in between

## [1] "Final.Exam"

paste("Final","and","Exam") #add 'and' in between

## [1] "Final and Exam"

4. substr(x,start,stop) returns the substring in the given character position range start:stop in the given string x.

substring("Equator",3,5)

## [1] "uat"

5. strsplit(x,split) splits a string x into an R list of substrings based on another string split in x

strsplit("11-28-2022",split="-")

## [[1]]
## [1] "11"   "28"   "2022"