On 23/11/2009, at 12:01 PM, Steven Kang wrote:
Hi all,
I get an error message when trying to replace *+* or *?* signs
(with empty
space) from a string.
x <- "asdf+,jkl?"
gsub("?", " ", x)
Error message:
Error in
gsub("?", " ", x) :
invalid regular expression '?'
In addition: Warning message:
In gsub("?", " ", x) :
regcomp error: 'Invalid preceding regular expression'
Your expertise in resolving this issue would be appreciated.
(a) That's funny. I don't get an error message when I try your example.
I get
[1] " a s d f + , j k l ? "
Of course that's not what you want, though.
(b) You need to escape the question mark:
> gsub("\\?", " ", x)
yields
[1] "asdf+,jkl "
which I think *is* what you want.
cheers,
Rolf Turner
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