regex - Extract the last word between | |

Question

I have the following dataset

> head(names$SAMPLE_ID)
[1] "Bacteria|Proteobacteria|Gammaproteobacteria|Pseudomonadales|Moraxellaceae|Acinetobacter|"
[2] "Bacteria|Firmicutes|Bacilli|Bacillales|Bacillaceae|Bacillus|"                            
[3] "Bacteria|Proteobacteria|Gammaproteobacteria|Pasteurellales|Pasteurellaceae|Haemophilus|" 
[4] "Bacteria|Firmicutes|Bacilli|Lactobacillales|Streptococcaceae|Streptococcus|"             
[5] "Bacteria|Firmicutes|Bacilli|Lactobacillales|Streptococcaceae|Streptococcus|"             
[6] "Bacteria|Firmicutes|Bacilli|Lactobacillales|Streptococcaceae|Streptococcus|" 

I want to extract the last word between || as a new variable i.e.

Acinetobacter
Bacillus
Haemophilus

I have tried using

library(stringr)
names$sample2 <-   str_match(names$SAMPLE_ID, "|.*?|")

Answer 1

We can use

library(stringi)
stri_extract_last_regex(v1, '\w+')
#[1] "Acinetobacter"

data

v1 <- "Bacteria|Proteobacteria|Gammaproteobacteria|Pseudomonadales|Moraxellaceae|Acinetobacter|"