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Valid Hashtag Characters (in PEGN)

(^|\s)([#＃][\w\u05be\u05f3\u05f4]*[\p{L}_]+[\w\u05be\u05f3\u05f4]*)

＃

Tag <-- '#'

• must begin with octothorp (#)
• numbers or letters
• underscore sparingly
• no dashes/hyphens
• no spaces
• don’t start with numbers

• don’t make entirely numbers

• What Characters Can A Hashtag Include?
  https://www.hashtags.org/platforms/twitter/what-characters-can-a-hashtag-include/
• Twitter Hashtags
  https://bloggingwizard.com/complete-guide-to-twitter-hashtags/
• regex - Which characters are allowed in hashtags - Stack Overflow
  https://stackoverflow.com/questions/36895543/which-characters-are-allowed-in-hashtags

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