Re: [R] String replace
On Wed, 3 Apr 2019 15:01:37 +0100 Graham Leask via R-help wrote: Suppose that `BHC$Date` contains a string "M_24". You do: > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_2" , > "01-04-2017")) before you have a chance to do: > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , > "M_24" , "01-02-2019")) So now it has "01-04-20174" because the first expression had a successful match and already made a replacement. help() for stringi::stringi-search-regex says that look-around expressions are supported, so one of the ways to prevent this would be to modify your patterns to look like e.g. 'M_2(?!\\d)' to match 'M_2' that is *not* followed by a digit. -- Best regards, Ivan __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] String replace
Try reversing the order, or extending the to-replace bit. "M_1" is finding and replacing "M_10", "M_11", etc. "M_2" is finding and replacing "M_20", "M_21", etc. So M_14 becomes "01-03-20174" In the future, a toy dataset would help with the reproducible example aspect, and make your question easier to answer. Sarah On Wed, Apr 3, 2019 at 1:24 PM Graham Leask via R-help wrote: > > > I’m attempting to replace a string variable that normally works fine. However > when trying to > do this with a string in the form of a date the output becomes corrupted. > > See below: > > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_1" , > "01-03-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_2" , > "01-04-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_3" , > "01-05-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_4" , > "01-06-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_5" , > "01-07-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_6" , > "01-08-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_7" , > "01-09-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_8" , > "01-10-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_9" , > "01-11-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_10" , > "01-12-2017")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_11" , > "01-01-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_12" , > "01-02-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_13" , > "01-03-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_14" , > "01-04-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_15" , > "01-05-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_16" , > "01-06-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_17" , > "01-07-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_18" , > "01-08-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_19" , > "01-09-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_20" , > "01-10-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_21" , > "01-11-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_22" , > "01-12-2018")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_23" , > "01-01-2019")) > BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_24" , > "01-02-2019")) > > The first line works fine but by the end the output is corrupted to > > "01-03-20174" > > > Any thoughts what I’m doing wrong here? > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Sarah Goslee (she/her) http://www.numberwright.com __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] String replace
I’m attempting to replace a string variable that normally works fine. However when trying to do this with a string in the form of a date the output becomes corrupted. See below: BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_1" , "01-03-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_2" , "01-04-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_3" , "01-05-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_4" , "01-06-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_5" , "01-07-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_6" , "01-08-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_7" , "01-09-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_8" , "01-10-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_9" , "01-11-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_10" , "01-12-2017")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_11" , "01-01-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_12" , "01-02-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_13" , "01-03-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_14" , "01-04-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_15" , "01-05-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_16" , "01-06-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_17" , "01-07-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_18" , "01-08-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_19" , "01-09-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_20" , "01-10-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_21" , "01-11-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_22" , "01-12-2018")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_23" , "01-01-2019")) BHC <-BHC %>% mutate ( Date = stringr :: str_replace ( Date , "M_24" , "01-02-2019")) The first line works fine but by the end the output is corrupted to "01-03-20174" Any thoughts what I’m doing wrong here? __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
