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RVerbalExpressions

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](https://twitter.com/kevin_ushey)
2. rebus by [@richierocks](https://twitter.com/richierocks?lang=en)

Contributing

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

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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