Best HashTag Regex

by

If you are pulling statuses containing hashtags from Twitter, you no longer need to find them yourself. You can now specify the include_entities parameter to have Twitter automatically call out mentions, links, and hashtags.

For example, take the following call to statuses/show:

http://api.twitter.com/1/statuses/show/60183527282577408.json?include_entities=true

In the resultant JSON, notice the entities object.

"entities":{"urls":[{"expanded_url":null,"indices":[68,88],"url":"http:\/\/bit.ly\/gWZmaJ"}],"user_mentions":[],"hashtags":[{"text":"wordpress","indices":[89,99]}]}

You can use the above to locate the specific entities in the tweet (which occur between the string positions denoted by the indices property) and transform them appropriately.

If you just need the regular expression to locate the hashtags, Twitter provides these in an open source library.

Hashtag Match Pattern

(^|[^&\p{L}\p{M}\p{Nd}_\u200c\u200d\ua67e\u05be\u05f3\u05f4\u309b\u309c\u30a0\u30fb\u3003\u0f0b\u0f0c\u00b7])(#|\uFF03)(?!\uFE0F|\u20E3)([\p{L}\p{M}\p{Nd}_\u200c\u200d\ua67e\u05be\u05f3\u05f4\u309b\u309c\u30a0\u30fb\u3003\u0f0b\u0f0c\u00b7]*[\p{L}\p{M}][\p{L}\p{M}\p{Nd}_\u200c\u200d\ua67e\u05be\u05f3\u05f4\u309b\u309c\u30a0\u30fb\u3003\u0f0b\u0f0c\u00b7]*)

The above pattern can be pieced together from this java file (retrieved 2015-11-23). Validation tests for this pattern are located in this file around line 128.

More Related Contents:

  1. Matching numbers with regular expressions — only digits and commas
  2. Can I use a Regex in an XPath expression?
  3. .NET – How can you split a “caps” delimited string into an array?
  4. How does RegexOptions.Compiled work?
  5. RegEx: Smallest possible match or nongreedy match
  6. Regex.IsMatch vs string.Contains
  7. Balancing groups in variable-length lookbehind [duplicate]
  8. Regular expression, split string by capital letter but ignore TLA
  9. Make regular expression case insensitive in ASP.NET RegularExpressionValidator
  10. Is there a regex flavor that allows me to count the number of repetitions matched by the * and + operators?
  11. How to Regex search/replace only first occurrence in a string in .NET?
  12. Regex for string not containing multiple specific words
  13. Regular expression for parsing links from a webpage?
  14. Regex replacement capture followed by digit
  15. Regex to match anything but two words
  16. Regular expression to find all table names in a query
  17. Regex for all PRINTABLE characters
  18. What is the difference between .NET Core and .NET Standard Class Library project types?
  19. Why is the first WCF client call slow?
  20. How do I parse and convert DateTime’s to the RFC 822 date-time format?
  21. Optimum file buffer read size?
  22. Does .NET have the history of time zone changes?
  23. What does MethodImplOptions.Synchronized do?
  24. Equivalent of Class Loaders in .NET
  25. How to check an exchange mailbox via powershell?
  26. How do I fill an empty textbox with default text?
  27. Service has zero application (non-infrastructure) endpoints
  28. When Would You Prefer DateTime Over DateTimeOffset
  29. When would SqlCommand.ExecuteReader() return null?
  30. Managing complex Web.Config files between deployment environments

Leave a Comment