On Jun 16, 2010, at 12:04 PM, Andrej wrote:
Dear all,
I'm trying to filter out the "number of leaves" (it should be 1 in the
example below) from the following string:
string
[1] "Java-Object{J48 pruned tree\n------------------\n: 0 (15.0/3.0)\n
\nNumber of Leaves : \t1\n\nSize of the tree : \t1\n}"
Any idea how to do that as simple as possible? Thanks in advance for
any advice.
?sub # or ?gsub if you need more than one pattern matched (they are
on the same page).
This should find the first occurrence of digits following a tab
terminated by a line feed and then return only the digits:
string <- "Java-Object{J48 pruned tree\n------------------\n: 0
(15.0/3.0)\n \nNumber of Leaves : \t1\n\nSize of the tree : \t1\n}"
sub("^.+\\t(\\d+)\\n.+$", "\\1", string)
[1] "1"
The parens within the search pattern are matched to "\\1". Need to
double backslashed within patterns.
Regards, Andrej
--
David Winsemius, MD
West Hartford, CT
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