(This is Debian bug 510219).

For instance, take U+02E2 MODIFIER LETTER SMALL S:

$ echo ˢ | sed -r 's/[a-z]|[^a-z]//'
ˢ

Expected output: nothing.

Sed does not handle “ˢ” (U02E2) as a letter (in [a-z]) nor as a
“non-letter” (in [^a-z]).

I will analyze this soonish.

-- 
           Summary: character does not match neither [a-z] nor [^a-z]
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: regex
        AssignedTo: drepper at redhat dot com
        ReportedBy: bonzini at gnu dot org
                CC: glibc-bugs-regex at sources dot redhat dot com,glibc-
                    bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=9697

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