Add support for POSIX predefined character classes

[anthony-chang]

Closes #4413

This PR adds support for \p{...} for these character classes defined here under "POSIX character classes (US-ASCII only)"

\p{Lower} | A lower-case alphabetic character: [a-z]
\p{Upper} | An upper-case alphabetic character:[A-Z]
\p{ASCII} | All ASCII:[\x00-\x7F]
\p{Alpha} | An alphabetic character:[\p{Lower}\p{Upper}]
\p{Digit} | A decimal digit: [0-9]
\p{Alnum} | An alphanumeric character:[\p{Alpha}\p{Digit}]
\p{Punct} | Punctuation: One of !"#$%&'()*+,-./:;<=>?@[\]^_`{\|}~
\p{Graph} | A visible character: [\p{Alnum}\p{Punct}]
\p{Print} | A printable character: [\p{Graph}\x20]
\p{Blank} | A space or a tab: [ \t]
\p{Cntrl} | A control character: [\x00-\x1F\x7F]
\p{XDigit} | A hexadecimal digit: [0-9a-fA-F]
\p{Space} | A whitespace character: [ \t\n\x0B\f\r]

Signed-off-by: Anthony Chang antchang@nvidia.com

[anthony-chang]

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[sameerz]

@anthony-chang @andygrove We are in burndown for 22.06. Is this meant to target 22.06, or should it be retargeted towards 22.08?

[andygrove]

@anthony-chang @andygrove We are in burndown for 22.06. Is this meant to target 22.06, or should it be retargeted towards 22.08?

Good point. @anthony-chang can you retarget for 22.08

[andygrove]

Please retarget for 22.08

[anthony-chang]

This is blocked until the fix in #5610 is merged

[andygrove]

This is blocked until the fix in #5610 is merged

@anthony-chang this has now been merged

PR has been retargeted to 22.08 now

[anthony-chang]

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[andygrove]

Is it intentional that only a subset are tested here?

[anthony-chang]

Yes, this one is mostly a sanity check since the \p{Print} transpilation recursively uses the definition of the 4 \p{} classes above it.
I tested the full set in the integration tests.

[anthony-chang]

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[anthony-chang]

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[anthony-chang]

I've removed _ from the Scala fuzz tests until a fix for rapidsai/cudf#11062 is made.

[anthony-chang]

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