Hi, May be this helps. lines<- readLines(textConnection("NM_019397 // Egfl6 // EGF-like-domain, multiple 6 // X F5|X 71.5 cM // 54156 NM_019397 // Egfl7 // EGF-like-domain, multiple 6 // X F5|X 71.5 cM // 54158")) library(stringr) word(lines,2,sep=" // ") #[1] "Egfl6" "Egfl7"
lines1<- readLines(textConnection("NM_019397 // Egfl6 // EGF-like-domain, multiple 6 // X F5|X 71.5 cM // 54156 NM_019397 // Egfl7 domain // EGF-like-domain, multiple 6 // X F5|X 71.5 cM // 54158")) word(lines1,2,sep=" // ") #[1] "Egfl6" "Egfl7 domain" A.K. ----- Original Message ----- From: Hon Kit (Stephen) Wong <hon...@stanford.edu> To: r-help@r-project.org Cc: Sent: Monday, May 20, 2013 7:45 PM Subject: [R] how to GREP out a string like this......THANKS. Dear ALl, I hope you could help me out on this simple problem. I have many thousand lines like this: NM_019397 // Egfl6 // EGF-like-domain, multiple 6 // X F5|X 71.5 cM // 54156 I want to extract the string inside the first // //, in this case is Egf16. How do I apply grep function? Thanks. Stephen HK Wong Stephen HK Wong Research Associate,Cleary Lab Lab Phone: 650-723-5340 MC 5457 Lokey Stem Cell Research Building 265 Campus Drive, Rm. G2035 Stanford, California 94305-5324 ______________________________________________ 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. ______________________________________________ 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.