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This question already has an answer here:

Unicode characters (as well as characters from the extended character-set) don’t work with the markdown in comments.

In a question or answer, when you use Unicode characters (or extended characters for example from code page 1252, etc.) it looks normal—the browser notwithstanding:

“Foo bar—baz.” = “Foo bar—baz.” (1252)

“Foo bar—baz.” = “Foo bar—baz.” (Unicode)

"Foo bar—baz." = "Foo bar—baz." (ASCII)

Now when you throw in markdown (for example italicizing), you get the following:

“*Foo* bar—**baz**.*” = “Foo bar—baz.” (1252)

“*Foo* bar—**baz**.*” = “Foo bar—baz.” (Unicode)

"*Foo* bar—**baz**.*" = "Foo bar—baz." (ASCII)

Okay, it looks fine. But when you do the same thing in a comment, the extended/Unicode characters are not recognized as non-alphanumeric characters/delimiters and prevent the markdown from working correctly.

Another example is spaces. You can use non-breaking or hair-spaces in questions and answers as normal:

"foo bar baz​blah" = "foo bar baz​blah" (there’s a zero-space width between baz and blah)

"*foo* bar **baz**​blah" = "foo bar baz​blah" (there’s a zero-space width between baz and blah)

Again, it’s fine, but when you put it in a comment, it breaks the markdown.

(I’ll add a comment with the examples.)

This may be related to this question, in which case a new system might be needed to handle character-set collation instead of a simple delimiter array.

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marked as duplicate by Gilles, Martijn Pieters, animuson Sep 27 '13 at 22:47

This question was marked as an exact duplicate of an existing question.

“Foo bar—baz.” = “Foo bar—baz.” (1252) “Foo bar—baz.” = “Foo bar—baz.” (Unicode) "Foo bar—baz." = "Foo bar—baz." (ASCII) “*Foo* bar—**baz**.*” = “Foo bar—**baz**.” (1252) “*Foo* bar—**baz**.*” = “Foo bar—**baz**.” (Unicode) "*Foo* bar—**baz**.*" = "Foo bar—**baz**." (ASCII) "foo bar baz?blah" = "foo bar baz?blah" (there’s a zero-space width between baz and blah) "*foo* bar **baz**?blah" = "foo bar baz?blah" (there’s a zero-space width between baz and blah) (Err, messy without newline support in comments.) – Synetech Jun 28 '11 at 3:56

This is by design.

We are much stricter about which characters are allowed to trigger Markdown in comments to avoid accidental, unwanted Markdown formatting.

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Are there a lot of people accidentally inserting extended and Unicode characters and markdown in comments? – Synetech Jun 28 '11 at 4:48

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