Okay, I just pushed a fix for this to master.
The following *replacement* escapes will now be recognized:
\x{hh}
\x{hhhh}
\x{hhhhhh}
where h is any hex character (0-9, a-f, A-F).
Note 1: the 6 hex character version is there to support the extended plane above the BMP allowing the first two hex chars to be less than or equal to "10" to indicate the plane. This may result in QChar pairs as needed to properly encode the entire value.
Note 2: using < 2, 3, 5, >6 hex chars will result in that escape code being ignored and treated just like any other string of characters so remember to prepend a "0" when needed to fit one of the required formats.
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