help in removal of fixed pattern
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 -- View this message in context: http://r.789695.n4.nabble.com/help-in-removal-of-fixed-pattern-tp4152524p4152524.html Sent from the R help mailing list archive at Nabble.com.
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