Hello,
I am trying to find a function name in a string that expresses a
functional form :
> s = "blabla...S(var)...blabla"
I would like to detect the pattern "S(*)" in s.
I am no guru at regular expressions. Just tried :
> grep("S(.*)",c("S(a)","CSP"))
[1] 1 2
>
I expected the pattern to be retrieved only in the first string, so
obviously this is not correct. Any idea ?
Thank you very much in advance,
Yvonnick Noel, PhD
U. of Rennes 2
France
NOEL Yvonnick wrote:> Hello, > > I am trying to find a function name in a string that expresses a > functional form : > > > s = "blabla...S(var)...blabla" > > I would like to detect the pattern "S(*)" in s. > > I am no guru at regular expressions. Just tried : > > > grep("S(.*)",c("S(a)","CSP"))grep("S\\(.*\\)",c("S(a)","CSP")) Uwe Ligges> [1] 1 2 > > > > I expected the pattern to be retrieved only in the first string, so > obviously this is not correct. Any idea ? > > Thank you very much in advance, > > Yvonnick Noel, PhD > U. of Rennes 2 > France > > ______________________________________________ > R-help at stat.math.ethz.ch 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.
Parnetheses have special meaning so they must be escaped or specify a character class of 1:> grep("S\\(.*\\)",c("S(a)","CSP"))[1] 1> grep("S[(].*[)]",c("S(a)","CSP"))[1] 1 On 7/3/07, NOEL Yvonnick <yvonnick.noel at free.fr> wrote:> Hello, > > I am trying to find a function name in a string that expresses a > functional form : > > > s = "blabla...S(var)...blabla" > > I would like to detect the pattern "S(*)" in s. > > I am no guru at regular expressions. Just tried : > > > grep("S(.*)",c("S(a)","CSP")) > [1] 1 2 > > > > I expected the pattern to be retrieved only in the first string, so > obviously this is not correct. Any idea ? > > Thank you very much in advance, > > Yvonnick Noel, PhD > U. of Rennes 2 > France > > ______________________________________________ > R-help at stat.math.ethz.ch 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. >