[BUG] RegExp transpiler fails to detect some choice expressions that cuDF cannot compile

[andygrove]

Describe the bug
During fuzz testing I found some patterns that the transpiler allows but cuDF does not support, such as [^\r\n]3$|}}\t. This is not valid because the left side of the choice ends with a line anchor, causing cuDF to fail during the compilation of the pattern.

Steps/Code to reproduce bug
Add this pattern to the "transpiler detects invalid cuDF patterns" test in RegularExpressionTranspilerSuite.

Expected behavior
Test should pass.

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

Additional context
None

[andygrove]

False alarm. This was only happening in a specific branch.