Ways to detect that XXXX in JSON \uXXXX does not correspond to a Unicode character?

[Mark Davis ☕️]

​The simplest approach would be to use ICU in a little program that scans
the file. For example, you could write a little Java program that would
scan the file, and turn any any sequence of (\uXXXX)+ into a String, then
test that string with:

static final UnicodeSet OK = new
UnicodeSet("[^[:unassigned:][:surrogate:]]]").freeze();
...
// inside the scanning function
boolean isOk​ = OK.containsAll(slashUString);

It is key that it has to grab the entire sequence of \uXXXX in a row;
otherwise it will get the wrong answer.


Mark <https://google.com/+MarkDavis>

*— Il meglio è l’inimico del bene —*

On Thu, May 7, 2015 at 10:49 AM, Doug Ewell <doug at ewellic.org> wrote:

> "Costello, Roger L." <Costello at mitre dot org> wrote:
>
> > Are there tools to scan a JSON document to detect the presence of
> > \uXXXX, where XXXX does not correspond to any Unicode character?
>
> A tool like this would need to scan the Unicode Character Database, for
> some given version, to determine which code points have been allocated
> to a coded character in that version and which have not.
>
> --
> Doug Ewell | http://ewellic.org | Thornton, CO ����
>
>
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