Add support for regular expressions containing hexadecimal digits greater than 0x7f
#5442
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Fixes #4866
cuDF only supports hexadecimal characters up to 0x7f, and we fallback to CPU for characters outside that range. This workaround converts hexadecimal digits directly to the Unicode character itself, allowing GPU support for the full range of hexadecimal digits.
Signed-off-by: Anthony Chang antchang@nvidia.com