Regex for Notepad++ to select everything but hashtags.* Replace with nothing or space.* Done!

  hashtag extraction.

(?<!#)\b[^#]+

  Selects all not-hashtagged stuff.* Replace it with a space or
  nothing.* Done! hint: To keep separate lines: FIRST: Replace ##
  with # THEN: Replace \r\n with ##\r\n THEN: Replace
  (?<!#)\b[^#]+* with nothing THEN: Replace ##\r\n with \r\n In my
  case, I needed to enclose them in <subject></subject> So I
  continued this way: Replace \r\n with </subject>\r\n then
  replace: # with* </subject><subject> then replace:
  \r\n</subject> with \r\n DONE!