RVerbalExpressions

AppVeyor Build status CRAN status CRAN_Download_Badge

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.

Installation

Install the released version of RVerbalExpressions from CRAN:

 install.packages("RVerbalExpressions")

Or install the development version from GitHub with:

 # install.packages("devtools")
devtools::install_github("VerbalExpressions/RVerbalExpressions")

Example

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

Other Implementations

You can see an up to date list of all ports on VerbalExpressions.github.io.

• JavaScript
• Ruby
• C#
• Python
• Java
• Groovy
• PHP
• Haskell
• Haxe
• C++
• Objective-C
• Perl
• Swift

Additionally, there are two R packages that try to solve the same problem. I encourage you to check these out:

1. rex by @kevinushey
2. rebus by @richierocks

Contributing

If you find any issues, typos, etc., please file an issue or submit a PR. All contributions are welcome!