Gsub a every element after a keyword in R

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Gsub a every element after a keyword in R



I'd like to remove all elements of a string after a certain keyword.
Example :


this.is.an.example.string.that.I.have



Desired Output :


This.is.an.example



I've tried using gsub('string', '', list) but that only removes the word string. I've also tried using the gsub('^string', '', list) but that also doesn't seem to work.


gsub('string', '', list)


gsub('^string', '', list)



Thank you.




3 Answers
3



Following simple sub may help you here.


sub


sub("\.string.*","",variable)



Explanation: Method of using sub


sub


sub(regex_to_replace_text_in_variable,new_value,variable)



Difference between sub and gsub:


sub


gsub



sub: is being used for performing substitution on variables.


sub



gsub: gsub is being used for same substitution tasks only but only thing it will be perform substitution on ALL matches found though sub performs it only for first match found one.


gsub


gsub


sub



From help page of R:


R



sub(pattern, replacement, x, ignore.case = FALSE, perl = FALSE,
fixed = FALSE, useBytes = FALSE)



gsub(pattern, replacement, x, ignore.case = FALSE, perl = FALSE,
fixed = FALSE, useBytes = FALSE)



You can try this positive lookbehind regex


S <- 'this.is.an.example.string.that.I.have'
gsub('(?<=example).*', '', S, perl=TRUE)
# 'this.is.an.example'



You can use strsplit. Here you split your string after a key word, and retain the first part of the string.


strsplit


x <- "this.is.an.example.string.that.I.have"
strsplit(x, '(?<=example)', perl=T)[[1]][1]

[1] "this.is.an.example"






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