The goal of RVerbalExpressions
is to make it easier to construct regular expressions using grammar and functionality inspired by VerbalExpressions. Usage of %>%
is encouraged to build expressions in a chain like fashion.
Install the released version of RVerbalExpressions
from CRAN:
Or install the development version from GitHub with:
This is a basic example which shows you how to build a regular expression:
library(RVerbalExpressions)
# construct an expression
x <- rx_start_of_line() %>%
rx_find('http') %>%
rx_maybe('s') %>%
rx_find('://') %>%
rx_maybe('www.') %>%
rx_anything_but(' ') %>%
rx_end_of_line()
# print the expression
x
#> [1] "^(http)(s)?(\\://)(www\\.)?([^ ]*)$"
# test for a match
grepl(x, "https://www.google.com")
#> [1] TRUE
You can see an up to date list of all ports on VerbalExpressions.github.io.
Additionally, there are two R packages that try to solve the same problem. I encourage you to check these out: