Dear Gabor, Many thanks. Works like a charm, but I can't get it to work with
"pmin(pmax(pmin(a,B),pmin(a,C,d))==Y,pmax(E,e))" i.e., with strings where there're no integers following the components in the pmin/pmax functions. Could this be generalized to handle both cases? Best wishes, Alrik -----Ursprüngliche Nachricht----- Von: Gabor Grothendieck [mailto:ggrothendi...@gmail.com] Gesendet: Samstag, 28. Februar 2015 13:35 An: Alrik Thiem Cc: r-help@r-project.org Betreff: Re: [R] Substring replacement in string On Fri, Feb 27, 2015 at 5:19 PM, Alrik Thiem <alrik.th...@gmail.com> wrote: > I would like to replace all lower-case letters in a string that are not part > of certain fixed expressions. For example, I have the string: > > "pmin(pmax(pmin(x1, X2), pmin(X3, X4)) == Y, pmax(Z1, z1))" > > Where I would like to replace all lower-case letters that do not belong to > the functions "pmin" and "pmax" by 1 - toupper(...) to get > > "pmin(pmax(pmin(1 - X1, X2), pmin(X3, X4)) == Y, pmax(Z1, 1 - Z1))" > Assuming x is the input string: gsub("(\\b[a-oq-z][a-z0-9]+)", "1-\\U\\1", x, perl = TRUE) ## [1] "pmin(pmax(pmin(1-X1, X2), pmin(X3, X4)) == Y, pmax(Z1, 1-Z1))" -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.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.
