A ^ normally matches either the start of string or the start of a new line 
(with the m flag).
I'd like to match only starts of lines, but not starts of strings, ideally 
without changing the regexp.

My source data is in a ReadSeeker, and if I use 
Regexp.FindReaderSubmatchIndex() I can get the first match - always the 
start of string - and then Seek back to the end of that match to get the 
next match.  Sadly, that one also then matches start-of-string, and there's 
no hope of finding my start of line locations.

On a string or []rune I'd ask for FindAll and get a long list of my line 
starts, but on a Reader it seems I'm hooped, as there is no All version.

Any advice? My reader comes from a fairly complex data structure that can 
be read in blocks - I was hoping to avoid managing expressions that might 
span blocks by putting the data through a Reader interface. Is there a 
better way?

Thanks,
  Paul

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