Yan -
Here's one way. It assumes there's exactly one set of
brackets in the string, and they can be anywhere:
aaa<- "up.6.11(16)"
sub('^.*?\\((.*)\\).*$','\\1',aaa)
[1] "16"
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
[email protected]
On Tue, 1 Feb 2011, Yan Jiao wrote:
Dear R guru:
If I got a variable
aaa<- "up.6.11(16)"
how can I extract 16 out of the bracket?
I could use substr, e.g.
substr(aaa, start=1, stop=2)
[1] "up"
But it needs start and stop, what if my start or stop is not fixed, I
just want the number inside the bracket, how can I achieve this?
Many thanks
yan
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