>So, can anyone show how to solve the original problem using (?R)? I'd love to 
>see more examples than what the docs provide.

I don't think you could do it in one pass. It would be possible if look-behind 
assertions could be of variable length, but they can't.

Find "(?<=<a href="[^"]+) +"
Replace "_"
(Both without the quotes.)

I suppose if you wanted to automate something like this and could not just 
repeat a simple search & replace until no more matches were found then you 
might do something like this:

Find:
(?<=<a href=)("[^"]+")
Replace:
\1=href

Find:
 +(?=[^"]+"=href)
Replace:
_

Find:
(?<=")=href
Replace with nothing

James

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