Brilliant! Thanks a million Ivan. Lion Bernard McGarvey
Director, Fort Myers Beach Lions Foundation, Inc. Retired (Lilly Engineering Fellow). > On February 11, 2019 at 3:13 PM Ivan Krylov <[email protected]> wrote: > > > On Mon, 11 Feb 2019 15:01:16 -0500 (EST) > Bernard McGarvey <[email protected]> wrote: > > > Now I try to split it using > > > > > > str_split(Fname1,"\\") > > > > > > but this returns an error > > > > > > Error in stri_split_regex(string, pattern, n = n, simplify = > > simplify, : Unrecognized backslash escape sequence in pattern. > > (U_REGEX_BAD_ESCAPE_SEQUENCE) > > This happens because the second parameter of str_split is by default a > regular expression, and a backslash has a special meaning in regular > expressions: when preceding other characters, it may change the way > they are interpreted. (For example, w means a literal "w" > character, while \w means "any alphanumeric character". On the > other hand, [ starts a character group, but \[ means just an opening > square bracket.) See ?regex for more info on that. > > Since you want a literal backslash, you need to escape it with another > backslash: \\ > > But to write a string literal of a double-backslash in R, you need to > escape both backslash characters, each with their own backslash: "\\\\" > > ## fname <- "D:\\Data\\OneDrive\\ISTA Documents\\QT_App\\QT Analysis > Input Data Example WorkBook.xlsx" > ## message("\\\\") > \\ > ## str_split(fname, "\\\\") > [[1]] > [1] "D:" > [2] "Data" > [3] "OneDrive" > [4] "ISTA Documents" > [5] "QT_App" > [6] "QT AnalysisInput Data Example WorkBook.xlsx" > > You can also avoid all layers of the backslash hell (except the first) > if you choose to split by fixed strings instead of regular expressions > by using stringr::fixed: > > ## str_split(fname, fixed("\\")) > > -- > Best regards, > Ivan ______________________________________________ [email protected] 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.
