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!