[BUG] Investigate more edge cases in regexp support

[andygrove]

Describe the bug
We have fuzz tests that are passing but through some experimentation I was able to make the fuzz tests generate previously unseen patterns and data and this exposes more edge cases where we are not consistent between CPU and GPU.

regexp_find examples

javaPattern=$x*\r, cudfPattern=(?:[\n\r\u0085\u2028\u2029]|\r\n)?$x*\r, input='\u000b.\r', cpu=true, gpu=false
javaPattern=\w[\r,B]\Z, cudfPattern=\w[\r,B](?:[\n\r\u0085\u2028\u2029]|\r\n)?$, input='D31b\r\n', cpu=false, gpu=true

regexp_replace examples

javaPattern=^$\s, cudfPattern=^([\n\r\u0085\u2028\u2029]|\r\n)?$[ \u000b\n\t\r\f], input='\n', cpu=_RE\PLACE_, gpu=\n
javaPattern=\s\Z\Z, cudfPattern=[ \u000b\n\t\r\f]([\n\r\u0085\u2028\u2029]|\r\n)?$, input='w\f\n', cpu=w_RE\PLACE__RE\PLACE_, gpu=w_RE\PLACE_\n

Steps/Code to reproduce bug
Add one or more extra character to RegularExpressionTranspilerSuiteREGEXP_LIMITED_CHARS_COMMON and run the existing tests.

Expected behavior
No failures.

Environment details (please complete the following information)
N/A

Additional context
None