R-alpha: R-beta: regex
Thomas Lumley <thomas@biostat.washington.edu> writes:
On 22 May 1997, Peter Dalgaard BSA wrote:
In what connection? In egrep, consider taking some of them out:
I meant the grep() function in R (which needs \ to be quoted)
grep("([A-Za-z][^:]*):\1","Ac:Ac",value=T)
character(0)
grep("([A-Za-z][^:]*):\\1","Ac:Ac",value=T)
character(0)
grep("([A-Za-z][^:]*):\\\1","Ac:Ac",value=T)
character(0)
but
grep("([A-Za-z][^:]*):","Ac:Ac",value=T)
[1] "Ac:Ac"
I strongly suspect that no number of \s will make it work as long as
do_grep() in main/character.c contains this line:
eflags = REG_NOSUB;
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-