[R] Escaping . in regular expression

If I run cvec-c(test.f, test.sf, try.g,try.res, try.f) print(cvec) indx-grep('\.f',cvec,perl=TRUE) fset-cvec[indx] print(fset) I get cvec-c(test.f, test.sf, try.g,try.res, try.f) print(cvec) [1] test.f test.sf try.g try.res try.f indx-grep(\.f,cvec,perl=TRUE) Warning messages: 1: '\.'

Re: [R] Escaping . in regular expression

You need double backslashes: grep('\\.f', cvec, value = TRUE) On Mon, Sep 14, 2009 at 4:25 PM, Prof. John C Nash nas...@uottawa.cawrote: If I run cvec-c(test.f, test.sf, try.g,try.res, try.f) print(cvec) indx-grep('\.f',cvec,perl=TRUE) fset-cvec[indx] print(fset) I get

Re: [R] Escaping . in regular expression

On 9/14/2009 3:25 PM, Prof. John C Nash wrote: If I run cvec-c(test.f, test.sf, try.g,try.res, try.f) print(cvec) indx-grep('\.f',cvec,perl=TRUE) fset-cvec[indx] print(fset) I get cvec-c(test.f, test.sf, try.g,try.res, try.f) print(cvec) [1] test.f test.sf try.g try.res try.f

Re: [R] Escaping . in regular expression

Thanks. That fixes things. I saw mention of \\. in ?Quotes, but the usage was not clear. I took it to mean the \ was to be printed. Maybe my little example would help, as ?Quotes doesn't have any. JN Henrique Dallazuanna wrote: You need double backslashes: grep('\\.f', cvec, value = TRUE)