jsonproc: filter out every non-alphanumeric character #1975
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Description
Instead of filtering out specific characters, filter out anything that isn't alphanumeric (and prevent digits from being the first character too).
A more proper fix would be decomposing characters with diacritics and using their "base letter" but that would take a proper Unicode library as the current code is not Unicode aware.
Fixes #1963 .
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