Regex and UTF-8

[Andrea Fontana]

I build a data access layer in c++. This layer works with mongo db where
string are always encoded using UTF-8. I've ported this layer in D using
swig. String is written correctly in console but when i use std.regex
sometimes it gives an exception:

core.exception.UnicodeException at src/rt/util/utf.d(290): invalid UTF-8
sequence

Byte sequence (for better undestanding) is:
[83, 195, 179, 32]

And the string was "Sò " (with accented o and a space)

I'm not a utf expert, so Is it a wrong utf-8 encoding or it is a bug on
utf.d? 

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