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What symbols/characters are not allowed in tags?

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On the sidebar it says that these are the Tag Characters:

Tag characters: [a-z 0-9 + # - .]

I'd assume anything not listed there is invalid.

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Do you know what happens when you assume? – Hilarious Comedy Pesto Sep 18 '09 at 17:25
You get struck by lightning? – Randell Sep 18 '09 at 17:26
You split assume into an array by substring index 0,3 3,1 4,2 – Ólafur Waage Sep 18 '09 at 17:29

At least for chat room tags I was just able to create a tag español for the Spanish chat room. I thought the system would automatically change it to espanol like it does for the question tags. So I went further and tried to create a 日本語 for the Japanese chat room, but it got converted to ???.

So the answer may be:

  • Some Latin-1 characters are no longer disallowed


  • That subsets of characters not allowed in question tags is different to that not allowed in chat room tags


  • There's a bug in chat room tags that allows you to use characters that are not supposed to be allowed
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