CODEWITHSUNDEEP
stringrextractgsub
user3153715
user3153715

Reputation: 1

extract part of a string in R

I wonder if you can help me extract a part of a string using R. I have some column d with the following elements :

d<-
    [1] Homo sapiens (Human)                                                                       
     [2] Pan troglodytes (Chimpanzee)                                                               
     [3] Pan troglodytes (Chimpanzee)                                                               
     [4] Nomascus leucogenys (Northern white-cheeked gibbon) (Hylobates leucogenys)                 
     [5] Macaca fascicularis (Crab-eating macaque) (Cynomolgus monkey)                              
     [6] Macaca mulatta (Rhesus macaque)                                                            
     [7] Macaca mulatta (Rhesus macaque)                                                            
     [8] Callithrix jacchus (White-tufted-ear marmoset)

I want to select every thing before the brackets, i.e the answer would be

d<-
    [1] Homo sapiens                                                     
     [2] Pan troglodytes                                                             
     [3] Pan troglodytes                                                              
     [4] Nomascus leucogenys                 
     [5] Macaca fascicularis                           
     [6] Macaca mulatta

Thanks

Upvotes: 0

Views: 3121

Answers (2)

r.bot
r.bot

Reputation: 5424

Also, stringr is a great package. 

library(stringr)
s <- "Homo sapiens (Human)"

t <- str_match(s, "^(.+)\\s\\(")[2]
t
[1] "Homo sapiens"

Upvotes: 3

Konrad Rudolph
Konrad Rudolph

Reputation: 546073

The easiest way in R is to delete everything starting at the parenthesis (including the preceding whitespace, if any):

result = sub(' *\\(.*$', '', d)

Upvotes: 3

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