Hi, I have a vector called nfichiers of 138 names of file whose extension is .P0 or P1 ... to P8. The script is not the same when the extension is P0 or P(1 to 8).
Examples of file names : [128] "Output0.P0" [129] "Output0.P1" [130] "Output0.P2" [131] "Output01102007.P0" [132] "Output01102007.P1" [133] "Output01102007.P2" [134] "Output01102007.P3" [135] "Output01102007.P4" To extract the names of file with .P0 extension I wrote : nfichiers[grep(".P0", nfichiers)] For the other extensions : nfichiers[grep(".P[^0]", nfichiers)] But for the last, I get a length of 138 that is the length of the initial vector although I have 130 files with .P0 extension. So I tried "manually" with a small vector : > s [1] "aa.P0" "bb.P0" "cc.P1" "dd.P2" > s[grep(".P[^0]", s)] [1] "cc.P1" "dd.P2" It works !!! Has someone an idea to solve this small problem ? Thanks in advance, Ptit Bleu. -- View this message in context: http://www.nabble.com/Must-be-obvious-but-not-to-me-%3A-problem-with-regular-expression-tp14370723p14370723.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list 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.