My google is failing me. I believe I've seen a package in R that allows you to construct a regular expression step by step. Something like
r = startswith("a") %>% endswith("b") # "^a.*b$"
Can someone remind me the name of the package?
My google is failing me. I believe I've seen a package in R that allows you to construct a regular expression step by step. Something like
r = startswith("a") %>% endswith("b") # "^a.*b$"
Can someone remind me the name of the package?
Hi @pdeffebach, could you say a little more about your context, and what you'd like to be able to do? I know of helper functions like those, but they don't produce regular expressions.
Maybe the ore
package
I just want to use regex to determine if a string matches a pattern, but you know the saying "you decide to do regex, now you have two problems". A MWE would be
street _names = c("myrtle street", "poplar st", "oak road", "maple rd")
find_streets = function(street_name) {
str_detect(street, "st$") | str_detect(street, "street")
}
I remember hearing about a package that allows users to construct something like a regular expression, without worrying about writing a regex itself.
So maybe something like http://buildregex.com/, but in R?
In RStudio, str_view()
and str_view_all()
can be useful for experimenting with regular expressions; I learned about them in section 14.3 of 'R for Data Science'.
One aid is regexplain
which has the added benefit of being an RStudio plugin. Another possibility is devtools::install_github("VerbalExpressions/RVerbalExpressions")
I haven't used any of these, and didn't see anything else. There may be constructors that you could use in other languages and paste the resulting expressions as a stringr
regex pattern that fit in a piped workflow
Cool! I think I'll be trying that out soon.
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