Wacek Kusnierczyk wrote:
markle...@verizon.net wrote:
can someone show me how to use a regular expression to break the
string at the bottom up into its three components :
(-0.791,-0.263]
(-38,-1.24]
(0.96,2.43]
I tried to use strplit because of my regexpitis ( it's not curable.
i've been to many doctors all over NYC. they tell me there's no cure
) but it doesn't work because there also dots inside the brackets.
Thanks.
(-0.791,-0.263].(-38,-1.24].(0.96,2.43]
here's one way to get a matrix of numeric values:
text = "(-0.791,-0.263].(-38,-1.24].(0.96,2.43]"
values = matrix(ncol=2, byrow=TRUE,
as.numeric(
grep(pattern='.', value=TRUE,
x=strsplit(x=text, split=']\\.\\(|\\(|]|,')[[1]])))
modify any of the steps according to your needs.
vQ
Here is another way with the gsubfn package:
> require( gsubfn )
> strapply( text, "\\(.*?,.*?]", perl = T )[[1]]
1] "(-0.791,-0.263]" "(-38,-1.24]" "(0.96,2.43]"
Note that gregexpr would also help you here:
> g <- gregexpr( "\\(.*?,.*?]", text, perl = T )[[1]]
> g
[1] 1 17 29
attr(,"match.length")
[1] 15 11 11
But there is always the missing part of extracting the match from the
result of (g)regexpr
> substring( text, g, g + attr(g, "match.length" ) - 1 )
[1] "(-0.791,-0.263]" "(-38,-1.24]" "(0.96,2.43]"
Romain
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Romain Francois
Independent R Consultant
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
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