[R] regex scares me

[Tony Plate]

I think this does the trick.  Note that it is case sensitive.

 > x <- c("lad.tab", "xxladyy.tab", "xxyy.tab", "lad.tabx", "LAD.tab", 
"lad.TAB")
 > grep("lad.*\\.tab$", x, value=T)
[1] "lad.tab"     "xxladyy.tab"
 >

Jon Minton wrote:
> Hi, apologies if this is too simple but I've been stuck on the following for
> a while:
> 
>  
> 
> I have a vector of strings: filenames with a name before the extension and a
> variety of possible extensions
> 
>  
> 
> I want to select only those files with:
> 
>  1) a ".tab" extension
> 
> AND 
> 
> 2) the character sequence "lad" anywhere in the name of the file before the
> extension.
> 
>  
> 
> Surely this won't take long to do, I thought. (But I was wrong.)
> 
>  
> 
> What's the regexp pattern to specify here?
> 
>  
> 
> Thanks,
> 
>  
> 
> Jon Minton
> 
>  
> 
>  
> 
> 
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> 
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