# library(tidyverse)
# str_extract('"a_1_2>2000"', '>\\d+')
text <- '"a_1_2>2000"'
library(rebus)
library(magrittr)
##
## Attaching package: 'magrittr'
## The following object is masked from 'package:rebus':
##
## or
library(stringr)
## Warning: package 'stringr' was built under R version 3.5.3
##
## Attaching package: 'stringr'
## The following object is masked from 'package:rebus':
##
## regex
text %>%
str_match(">(\\d{4})") %>% .[1,2]
## [1] "2000"