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How do comment @replies work?

In some comments, I like to use @ to refer back to the user. That is easy with @amalloy, but I can't get @Arthur Ulfeldt to underline.

What am I doing wrong?

How can I get a two or greater word name to reference properly?

Thanks.

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marked as duplicate by Dennis, jadarnel27, amanaP lanaC A nalP A naM A, Arjan, Michael Petrotta Jul 13 '12 at 14:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
You can only reply to users that have commented on or edited the post. if Arthur Ulfeldt hasn't commented on or edited that post, such a reply is not possible. –  Jim Jul 13 '12 at 14:30
    
Thanks. I'll go look at that post. –  octopusgrabbus Jul 13 '12 at 14:47

2 Answers 2

As you're typing you should be shown a potential match with autocomplete that you can select. In most cases you'll find that spaces and certain characters are just removed. The following example shows me starting to mention the handle of Anthony Pegram which gets simplified to AnthonyPegram:

enter image description here

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For really long names, just hit the TAB key as soon as the autocomplete shows the proper name. –  Yawus Jul 13 '12 at 14:38

From How do comment @replies work?:

Spaces are removed from the display names for matching purposes. So to match Peter Smith you may use @pet, @peter, @peters, or @petersmith. The last two are useful if Peter Jones is also participating, who can then be distinguished using @peterj. However, no spaces are allowed in the @name itself. Like to notify P Smith, one must use @psm or @psmith. (Here @P Smith would be handled as just @P, which is too short.) Single quotes, dots, dashes and underscores should not be removed.

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