While browsing M.SE, I came along this comment.

Out of curiosity I tried to put a comment-reply. Copy-paste is working (this time), but can't we have an autocompletion right after the @?

BTW: Which characters are allowed in user names? I got this, saying that $\LaTeX$ won't be rendered.

Would an @ be allowed? I thought about giving it a try, but I fear that comment replies won't work anymore since only 1 @ seems to be allowed in a comment, see here for some experiments.

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    $\begingroup$ But "אליהו צלע" is perfectly standard... :-P $\endgroup$ – Asaf Karagila Jan 28 '13 at 22:34
  • $\begingroup$ @AsafKaragila depending on your reference system that's true. To make one thing clear, this isn't not meant in any offending way at all... $\endgroup$ – draks ... Jan 28 '13 at 22:42
  • $\begingroup$ Oh, I was poking fun at all you folks who don't speak fluent Hebrew.:-P $\endgroup$ – Asaf Karagila Jan 28 '13 at 22:43
  • $\begingroup$ @AsafKaragila מַצְחִיק , I hope that's not wrong... $\endgroup$ – draks ... Jan 28 '13 at 22:47
  • $\begingroup$ It's correct... $\endgroup$ – Asaf Karagila Jan 28 '13 at 22:49
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    $\begingroup$ I should probably add that the autocompletion works fine if you type in Hebrew letters. $\endgroup$ – Asaf Karagila Jan 28 '13 at 23:00
  • $\begingroup$ @AsafKaragila I should look out for user with ä,ö,ü or ß in the username and give it a try. Is hebrew written from right to left? $\endgroup$ – draks ... Jan 28 '13 at 23:04
  • $\begingroup$ Yes, it is a right to left text (which makes almost all text editing annoying as hell). $\endgroup$ – Asaf Karagila Jan 28 '13 at 23:09
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    $\begingroup$ Hi guys, how's it going? $\endgroup$ – user856 Jan 29 '13 at 1:08
  • $\begingroup$ @ℝⁿ. Not bad. You do realize that you are stuck with this username for 30 days, right? $\endgroup$ – user53153 Jan 29 '13 at 1:10
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    $\begingroup$ @5PM: That is a burden I am willing to $\require{enclose}\enclose{updiagonalstrike}{\text{bear}}$impose on everyone who wants to reply to me. (Sorry...) $\endgroup$ – user856 Jan 29 '13 at 1:21
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    $\begingroup$ @Asaf: oh heck no. I want to see him suffer. :-) $\endgroup$ – Willie Wong Jan 29 '13 at 8:31
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    $\begingroup$ BTW, I can verify that if you know how to type ℝ in unicode (I use the LaTeX input method plugin for iBus), autocompletion for @ℝⁿ.also works. $\endgroup$ – Willie Wong Jan 29 '13 at 8:40
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    $\begingroup$ I just realized that there is an additional not in my first comment. Please disreagrd it... $\endgroup$ – draks ... Jan 29 '13 at 11:19
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    $\begingroup$ @ℝⁿ. The new autocomplete-with-nonASCII feature automatically brings up your username. So there. $\endgroup$ – user53153 Feb 26 '13 at 2:26

In this post Atwood specified the allowed username format as ^[\w](?<!_), and helpfully added the image below. If I understand correctly, (?<!_) prohibits usernames beginning with an underscore.

By the way, the userpage URL stays within ASCII. Some non-ASCII characters like é are converted to ASCII, others are simply dropped.

allowed characters


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