I have a regular expression that has differing behavior between v18 and V19 B1.
Test Cases:
TestFn(Keyword, keyword) x
Test2(Akey, Bkey)x
Regular Expression: Unix
\:b+[A-Za-z0-9_]+.*?\([A-Za-z0-9]+,\:b+([A-Za-z0-9]+)\)\:b*
Multiline mode is not checked.
Case-sensitive is checked.
In v18, it behaves as I would expect and matches both lines (excluding the trailing 'x'). In v19 B1 it only matches the first line, which has a trailing space, despite the fact that the \:b* on the end shouldn't require a trailing space.