gregexpr("\\at|\\og", text)
> -----Original Message-----
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of Corey Sparks
> Sent: Wednesday, February 25, 2009 11:50 AM
> To: R Help
> Subject: [R] Using gregexpr with multiple search elements
>
> Dear list,
> I am trying to use gregexpr to see if entries in a dataframe
> have either of two possible values for a string.
> here's an example
> text<-c("fat", "rat", "cat", "dog", "log", "fish")
>
> If I just wanted to find if any one of the elements in text
> match the pattern "at" I would do gregexpr("\\at", text)
>
> which would match on the first three elements, you can do
> something like ifelse(gregexpr("\\at",text)>-1, 1,0)
>
> to see if a particular entry in the data "text" is matched.
> My problem is I need to check if either of two patterns match
> in the data, an example that doesn't work is
> gregexpr(c("\\at", "\\og"), text)
>
> which is the basic form of what I'm looking to do, if this
> would work I would get a match for elements 1 through 5 of
> text, since either "at" or "og" occurs.
>
> If anyone might have an idea about this I would greatly appreciate it.
> Best,
> Corey
>
> Corey Sparks
> Assistant Professor
> Department of Demography and Organization Studies University
> of Texas at San Antonio One UTSA Circle San Antonio, TX 78249
> 210 458 6858 corey.spa...@utsa.edu
>
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