2. Why Are You Telling Me This?

3. What is a hashtag? Any string which starts with the “#” symbol?

5. Vote Bush! # Don’t

6. My dog died # :-(

7. Einstein # e=mc^2

8. I’m on bus # 123

10. # web2.0

11. # a-b

12. # *.*

13. # £100

16. ＃is U+FF03 or ＃ or ＃ Fullwidth Number Sign http://www.fileformat.info/info/unicode/char/ff03/index.htm

17. Letters and Numbers and...

19. We're #1

20. Love the new characters in #90210

21. Stupid broken websites #404

22. Why is the answer always #42

23. ...and “foreign” letters... # Français == #Francais

24. ...No Punctuation... #web2.0

25. ...No Punctuation... # web2 .0

26. #IsThisTweetTooLong?

27. # IsThisTweetTooLo ng ?

30. U+0020 SPACE

31. U+0085 NEL (control character next line)

32. U+00A0 NBSP (NO-BREAK SPACE)

33. U+1680 OGHAM SPACE MARK

34. U+180E MONGOLIAN VOWEL SEPARATOR

35. U+2000–U+200A (different sorts of spaces)

36. U+2028 LS (LINE SEPARATOR)

37. U+2029 PS (PARAGRAPH SEPARATOR)

38. U+202F NNBSP (NARROW NO-BREAK SPACE)

39. U+205F MMSP (MEDIUM MATHEMATICAL SPACE)

40. U+3000 IDEOGRAPHIC SPACE

41. http://en.wikipedia.org/wiki/Whitespace_character

42. http://en.wikipedia.org/wiki/Space_%28punctuation%29#Table_of_spaces

43. One Regex To Rule Them All preg_match_all ('$(^|[^0-9A-Z&/]+)([# ＃ ]+)([0-9A-Z_]*[A-Z_]+[a-z0-9_üÀ-ÖØ-öø-ÿ]*)$i', $tweet, $matches); http://github.com/mzsanford/twitter-text-php/

44. ...One Regex to find them...

45. ...and in the darkness bind them

46. But Why Is It Important? #WarbleCamp #warblecamp #WarbleCamp! #W àrblëçámp Disambiguation

47. #ThankYou! Resources: http://github.com/mzsanford/twitter-text-php/ http://engineering.twitter.com/ http://shkspr.mobi/blog/?p=1730 http://shkspr.mobi/blog/?p=1706