Those are Unicode codepoints. For example:
http://www.fileformat.info/info/unicode/char/92/index.htm 
<http://www.fileformat.info/info/unicode/char/92/index.htm>

> On Mar 3, 2017, at 5:14 AM, Daniele Giglio <[email protected]> wrote:
> 
> Excuse me, can you please explain me where these hex values come from?
> 
>     '[\x91\x92]': "'"
> 
> According to ASCII table '`' corresponds to x60, and 'ยด' to xB4.
> Bye.
> 
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