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/help/privileges/create-tags reads as follows:

Simply enter a new tag with your question and it will be created. When creating your new tag, bear in mind that tags ...

  • must be shorter than 25 characters
  • must use the character set a-z 0-9 + # - .

This is false - tags must be at most 25 characters in length (i.e. 25-character tags are permitted).

(This is also a doc bug at least on ja.SO, where it reads 「25 文字未満」, which means "shorter than 25 characters".)

1
  • 1
    This is now done on the sites where the Help Center is in English.
    – user302202
    Aug 18, 2016 at 13:43

1 Answer 1

3

This has been (and reflects the change of the character limit to 35); the page now reads

Simply enter a new tag with your question and it will be created. When creating your new tag, bear in mind that tags ...

  • must be no longer than 35 characters
  • must use the character set a-z 0-9 + # - .

This was changed somewhere between May 2016 and (according to the comment on the question) August 2016.

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