[R] help with regexpr in gsub

[Gabor Grothendieck]

Try this:

> gsub("[.].*", "", "GO:0008104.ISS")
[1] "GO:0008104"

On 1/17/07, Kimpel, Mark William <mkimpel at iupui.edu> wrote:
> I have a very long vector of character strings of the format
> "GO:0008104.ISS" and need to strip off the dot and anything that follows
> it. There are always 10 characters before the dot. The actual characters
> and the number of them after the dot is variable.
>
> So, I would like to return in the format "GO:0008104" . I could do this
> with substr and loop over the entire vector, but I thought there might
> be a more elegant (and faster) way to do this.
>
> I have tried gsub using regular expressions without success. The code
>
> gsub(pattern= "\.*?" , replacement="", x=character.vector)
>
> correctly locates the positions in the vector that contain the dot, but
> replaces all of the strings with "". Obviously not what I want. Is there
> a regular expression for replacement that would accomplish what I want?
>
> Or, does R have a better way to do this?
>
> Thanks,
>
> Mark
>
> Mark W. Kimpel MD
>
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