gistfile1.txt

/ [ # non capturing group 1
    $<a>=[ # non capturing group 2, saved into named capture a
      '{' # match a { 
      ~   # with stuff in between (or some kind of "until", maybe)
      '}' # finish with a }
      .+? # btw, the stuff in between is anything, but as little as possible 
      ] # non capt group 2 done
  ]+ # non capt group 1 done, but get multiple of those 
  % # separated by
  <-[{]>+ # any number of not-{
  /