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? Dan -- ************************************************************** Daniel Brewer, Ph.D. Institute of Cancer Research Email: daniel.brewer at icr.ac.uk ************************************************************** The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP. This e-mail message is confidential and for use by the a...{{dropped:2}}
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