Easier is grep("|", stringvector, extended = FALSE)
The only reason for having basic regexps in R is to avoid some of the escaping needed. On Tue, 23 Oct 2007, Duncan Murdoch wrote: > On 23/10/2007 6:34 AM, Daniel Brewer wrote: >> Hi, >> >> I am having a problem searching for the "|" character in a string. >> >>> grep("|",stringvector) >> Gives all the strings in a vector but when I try to escape it >>> grep("\|",stringvector) >> It comes up with the error >> Warning messages: >> 1: '\|' is an unrecognized escape in a character string >> 2: unrecognized escape removed from "\|" >> >> >> Anyone know how to solve this? > > Grep needs to see the escape character, so you need to escape that too, > i.e. use > > > grep("\\|",stringvector) > > The \\ is the way to enter a single backslash in an R string. The > vertical bar isn't special to R, so it doesn't need escaping at that level. > > Duncan Murdoch > > ______________________________________________ > 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. > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ 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.