I am a confused linguist trying to use R to collect data from twitter. I have been using the package twitteR and it has been working pretty well with fixed strings, but I'd like to ask it to get tweets that include "querendo + infinitive verb". In Portuguese, verbs in the infinitive always end with the character 'r'. How can I ask for words that end with a specific character?
searchtwitteR(" ", n = 1000, lang = pt, locate = Brazil)
There are lot of ways to do this. Consider words as a vector
words <- c('rock', 'tempr', 'infinitr', 'end', 'twitter')
In base R :
1) Using endsWith
words[endsWith(words, 'r')]
#[1] "tempr" "infinitr" "twitter"
2) Using grep
grep('r$', words, value = TRUE)
3) grepl
words[grepl('r$', words)]
Using stringr :
library(stringr)
1) str_detect
words[str_detect(words, 'r$')]
2) str_subset
str_subset(words, 'r$')
We can use stri_detect from stringi
library(stringi)
words[stri_detect(words, regex = 'r$')]
#[1] "tempr" "infinitr" "twitter"
Or with substring from base R
words[substring(words, nchar(words)) == 'r']
words <- c('rock', 'tempr', 'infinitr', 'end', 'twitter')
