text = "This is a String"
toupper(text)[1] "THIS IS A STRING"tolower(text)[1] "this is a string"Working With Strings, a Few Tricks
Basics of R for Data Science
Uppercase and lowercase with toupper() and tolower()
Replace a character with another in a string using gsub()
text = "this is a string"
gsub("t", "X", text)[1] "Xhis is a sXring"Removing all punctuation
text = "This is a string. For some reason, there is some punctuation."
gsub("[[:punct:]]", "", text)[1] "This is a string For some reason there is some punctuation"Removing all digits
text = "in this string231 there are some 1241useless digits 443perhaps because 3434someone copied and pasted 985from a pdf"
gsub("[[:digit:]]", "", text)[1] "in this string there are some useless digits perhaps because someone copied and pasted from a pdf"Splitting a string into a vector of words
text = "this is a string"
unlist(strsplit(text, split=" "))[1] "this" "is" "a" "string"Note: strplit() actually does the job, but it returns a list; if you want a vector for convenience, use unlist() on the output list
Removing a few cases from a vector
myVect = c("this", "is", "a", "vector")
myVect[!myVect %in% c("is", "a")][1] "this" "vector"Counting characters in strings
myVect = c("this", "is", "a", "vector")
nchar(myVect)[1] 4 2 1 6Turning a vector of strings into a single string
myVect = c("this", "is", "a", "vector")
paste(myVect, collapse=" ")[1] "this is a vector"