Thanks, Martin. I did not realize that. I never used perl compatible regex before but seems now I should!
Richard -----Original Message----- From: Martin Morgan [mailto:mtmor...@fhcrc.org] Sent: Monday, April 13, 2009 12:08 PM To: Tan, Richard Subject: Re: [R] toupper does not work in sub + regex "Tan, Richard" <r...@panagora.com> writes: > Hi, I don't know what I am doing wrong to the toupper does not seem > working in sub + regex. The following returns 's' not the upper class > 'S' as I expect: > > sub("q_([a-z])[a-zA-Z]*",toupper('\\1'),"q_sviRaw") you're expecting toupper to be evaluated after substitution, but it is evaluated before: toupper('\\1') ==> '\\1'. try sub("q_([a-z])[a-zA-Z]*",'\\U\\1',"q_sviRaw", perl=TRUE) > Can someone tell me where I did wrong? > > Thanks, > Richard > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. -- Martin Morgan Computational Biology / Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 Location: Arnold Building M1 B861 Phone: (206) 667-2793 ______________________________________________ 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.