A great function for extracting pattern matches is 'm()'
library(caroline)
vect <- m('([xX][0-9])',df$Input)
toupper(vect) #in case you really want all upper case x's
It does the hard work of using 'sub' to remove the non-matching parts
(sub, grep, regexpr, etc aren't very good for this sort of thing)
It also can return a data.frame if you have multiple patterns you wish to
match in each string vector element.
-Dave
On Fri, 2 Dec 2011, arunkumar1111 wrote:
Hi
I have column name as given below
If the variable is in log(X1 + 1) pattern it should be removed and i need
only X1
Input
log(x1 + 1)
x2
log(X3 +1)
Expected Output X1 X2 X3
Please help me
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