code: def _remove_curly_braces(text):
    
    current_pos = 0
    depth = 0
    ret = ""
    for match in re.finditer("[{}]", text):
      if depth == 0:
        ret += text[current_pos:match.start()]
      depth += 1 if text[match.start()] == "{" else -1
      current_pos = match.end()
    if depth != 0:
      # Many articles have mismatched braces, but it still seems better to remove
      # them than not.
      pass
    else:
      ret += text[current_pos:]
    return ret
docs: Remove everything in curly braces.
  
    Curly braces may be nested, so we keep track of depth.
  
    Args:
      text: a string
    Returns:
      a string