regex ops don't have the same consistency to == as other ops

[moodymudskipper]

The code of in_regex should be reviewed and look more like %in{}%, the rhs should be just as flexible.

• "a" %in~% c("^b","^a") should definitely return TRUE
• Corner cases like "ab" %in~% quote(a) seem absurd but should be supported for consistency.

[moodymudskipper]

actually quote(a) %in~% "a" works and it is the one which should work.

as for vectors of patterns, that's closed by https://github.com/moodymudskipper/rangeops/commit/6a3c43ba54c52d7808a445ede58f503a2fb7348f