[R] Search a function name in a string

[NOEL Yvonnick]

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