[R] gsub warning message

[Talbot Katz]

Hi.

I am using R 2.5.1 on a Windows XP machine.  Here is an example of a piece 
of code I was running in older versions of R on the same machine.  I am 
looking for underscores and replacing them with periods.  This result is 
from R 2.4.1:

>gsub ( "\\_+","\.","AAA_I")
[1] "AAA.I"
>

Here is what I get in R 2.5.1:

>gsub ( "\\_+","\.","AAA_I")
[1] "AAA.I"
Warning messages:
1: '\.' is an unrecognized escape in a character string
2: unrecognized escape removed from "\."
>

I still get the same result, which is what I want, but now I get a warning 
message.  Am I actually doing something wrong that the previous versions of 
R didn't warn me about?  Or is this warning message unwarranted?  Is there a 
fully approved method for getting the same functionality?  Thanks!

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