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Right now the sidebar says that the allowed characters for tags are:

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

Is it possible to extend this to support other characters? As the Stack-Exchange network gets bigger, more and more use-cases seem to appear for additional characters.

For example, the "!" character could be useful for web applications (this company is called "Yahoo!", not "yahoo" ) and for gaming (this game is named "Stars!").

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While I don't disagree in principal, can you say that having "yahoo!" vs "yahoo" would greatly increase your ability to find what you're after? (the main purpose of tags) That's where I question how valuable allowing more characters would be, maybe there are some better examples where the difference is more important? –  Nick Craver Nov 28 '10 at 16:17
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@Nick the second example, "Stars!", is a bit better. Still, you have a point, and currently I do not have better examples. –  Oak Nov 28 '10 at 16:36
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What about "D&D" (rpg.se)? –  RMorrisey Jul 29 '11 at 2:06
    
In addition to D&D, RPG.se also includes RPGs such as M&M (Mutants & Masterminds), T&T (Tunnels & Trolls), C&C (Castles & Crusades), and a few minor ones. All of these are fairly popular in the gaming world, so that stack exchange would certainly benefit from an ampersand being allowed. –  Thunderforge Apr 12 '13 at 1:13

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