R grep finds multiple complete words in a vector

Question

I have a vector of strings, say:

vect<-c("oxidor magnesio","oxido magnesio","oxido calcio", "oxidante","oxido calcio magnesio","magnesio oxido")

I would like to find occurrences of both words, "oxido"

and "magnesio"

. What i do is

intersect(grep("\\boxido\\b",vect),grep("\\bmagnesio\\b",vect))

But,

Question 1 : is there any direct grep command to achieve it?
Question 2 : Suppose I want to find occurrences of both words, but in a specific order (say, for example, "oxide" followed by "magnesio", so the correct answer is 2

and 5

). Which team?

Thank,

+3

PavoDive May 26 '15 at 17:00

1 answer

Alexey Ferapontov · Accepted Answer · 2015-05-26T17:12:14+0000

Edit. Answer 1: I know I am grepl

capable of this, for example:

> grepl("(?=.*\\boxido\\b)(?=.*\\bmagnesio\\b)", vect, perl = TRUE)
[1] FALSE  TRUE FALSE FALSE  TRUE  TRUE

Answer 2:

> grep("\\boxido\\b.*\\bmagnesio\\b",vect,v=T)
[1] "oxido magnesio"        "oxido calcio magnesio"