search for: lookaround

...er, there is a way to get the result you want using perl: ```R gsub("([aeiouAEIOU])(?=[aeiouAEIOU])", "\\1_", "aerioue", perl = TRUE) ``` The specific change I made is called a positive lookahead, you can read more about it here: https://www.regular-expressions.info/lookaround.html It's a way to check for a piece of text without consuming it in the match. Also, since you don't care about character case, it might be more legible to add ignore.case = TRUE and remove the upper case characters: ```R gsub("([aeiou])(?=[aeiou])", "\\1_", "ae...

...ant using perl: > > ```R > gsub("([aeiouAEIOU])(?=[aeiouAEIOU])", "\\1_", "aerioue", perl = TRUE) > ``` > > The specific change I made is called a positive lookahead, you can read > more about it here: > > https://www.regular-expressions.info/lookaround.html > > It's a way to check for a piece of text without consuming it in the match. > > Also, since you don't care about character case, it might be more legible > to add ignore.case = TRUE and remove the upper case characters: > > ```R > gsub("([aeiou])(?=[aeio...

...> gsub("([aeiouAEIOU])(?=[aeiouAEIOU])", "\\1_", "aerioue", perl = TRUE) > > ``` > > > > The specific change I made is called a positive lookahead, you can read > > more about it here: > > > > https://www.regular-expressions.info/lookaround.html > > > > It's a way to check for a piece of text without consuming it in the match. > > > > Also, since you don't care about character case, it might be more legible > > to add ignore.case = TRUE and remove the upper case characters: > > > > ```...

Hi all, I tested next command: gsub("([aeiouAEIOU])([aeiouAEIOU])", "\\1_\\2", "aerioue") with the following output: [1] "a_eri_ou_e" So, there are two consecutive vowels where an underscore is not added. May it be a bug? Is it expected (bug or not)? Is there any chance to get what I want (an underscore between each pair of consecutive vowels)?

...rts<-unlist(matches) lengths<-unlist(sapply(matches, attributes)) stops<-starts+lengths-1 substr(a, starts, stops) What is still missing is that the disallowed string is not just "<[wc]" but "<[wc] " and I don't know how to do that. Any ideas (preferably with lookarounds)? Thanks a bunch, STG -- Stefan Th. Gries ----------------------------------------------- University of California, Santa Barbara http://www.linguistics.ucsb.edu/faculty/stgries ----------------------------------------------- ORIGINAL MESSAGE > Dear all > > I again have a regular expres...

Last one for you guys: The command: length(gregexpr('cus','hocus pocus')[[1]]) [1] 2 returns the number of times the substring 'cus' appears in 'hocus pocus' (which is two) It's returning the number of **disjoint** matches. So: length(gregexpr('aa','aaa')[[1]]) [1] 1 returns 1. **What I want to do:** I'm looking for a way to count

Hi all I have a question regarding differences in the way gregpexr works in R 2.3.0 and R 2.4.0. In R 2.3.0, this is what happens: > gregexpr(" [a-z] [a-z] ", " a b c d e f ", perl=T) [[1]] [1] 1 3 5 7 9 attr(,"match.length") [1] 5 5 5 5 5 ... while in R 2.4.0, this is what happens: > gregexpr(" [a-z] [a-z] ", " a b c d e f ", perl=T)