New Issue: Should there be regexp literals

17219, "leekillough", "Should there be regexp literals", "2021-02-22T17:14:04Z"

Should Chapel support a regexp literal?

Should the syntax be something like r"a|b$", with special handling of regexp metacharacters?

Should trailing options be allowed, such as r"a|b$"i to indicate case-insensitivity?

Should this literal be compiled at program startup and kept around indefinitely, instead of compiled on-demand and kept in a finite-sized cache?