On Mon, 14 Jul 2008, Erik Iverson wrote:
gregexpr("\\(", frg)
Better
gregexpr("(", frg, fixed=TRUE)
(there is no regular expression here), but in this case
which(unlist(strsplit(frg, "")) == "(")
is more efficient (especially if you want to do further manipulations on
the individual characters, as Hau Li's followup seems to require).
Hua Li wrote:
Hi All,
I'm wondering whether there is a quick way to know the position of a
specific charcater in a long character:
for example
frg="((D:41.04,I:41.04):45.05,(((E:2.32,((G:0.67,J:0.67):0.44,H:1.11):1.21)"
and I would like to know that the 1st, 2nd, 26th, 27th, 28th ...
character is "(", is there a quick way to do that?
Thanks!
Hua
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