Dear Steven,

You were almost there:

> x <- "asdf+,jkl?"
> gsub("\\?", "", x)
[1] "asdf+,jkl"

> gsub("\\+", "", x)
[1] "asdf,jkl?"

Take a look at the "Basic Regular Expressions" section in ?regex for more
details.

HTH,
Jorge


On Sun, Nov 22, 2009 at 6:01 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.
>
> Thanks.
>
>
>
> Steven
>
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>
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