[R] Regex matching that gives byte offset?

[Johannes Graumann]

Hi,

Is there any way of doing 'grep' ore something like it on the content of a 
text file and extract the byte positioning of the match in the file? I'm 
facing the need to access rather largish (>600MB) XML files and would like 
to be able to index them ...

Thanks for any help or flogging,

Joh