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isogram/regex_hashtag.md

Last active August 29, 2015 14:28
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Regex Hashtag
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regex_hashtag.md
  1. Catch hashtag exclude starting and ending with underscore
    (?:\s|^)(?:#(?!(?:\d+|\w+?_|_\w+?)(?:\s|$)))(\w+)(?=\s|$)
  2. Catch hashtag include starting and ending with underscore
    (?:\s|^)(?:#(?!\d+(?:\s|$)))(\w+)(?=\s|$)
  3. Catch repeating words (only catch 1 if duplicate) (?!.*\b\1\b)

You can test regex at https://regex101.com/

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