text: Title: Accessing matches in regular expression globbing
  Body: In regular expression globbing (or even in regular globbing), it would be nice if we could access the Match object (https://docs.python.org/3/library/re.html#match-objects) corresponding to each resulting match. 
  
  For example, replacing this:
  ```xsh
  for filepath in `data/(.*)/(.*)/.*\.png`:
      match = re.match(r'data/(.*)/(.*)/.*\.png', filepath)
      dir1, dir2 = match.groups() 
  ```
  with something like:
  ```xsh
  for match in m`data/(.*)/(.*)/.*\.png`:
      dir1, dir2 = match.groups() 
  ```
  
  
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