- **NEW**: Added new back reference `\h` to Re. To get similar functionality with Regex, users must update to the latest Regex release.
4.4.0
- Added the following binary properties for Unicode 13.0 support (Python 3.9): `emoji`, `emojicomponent`, `emojimodifier`, `emojimodifierbase`, and `emojipresentation`. Associated aliases are also included: `ecomp`, `emod`, `ebase`, and `epres`.
4.3.0
- **NEW**: Install Regex library along Backrefs via `pip install backrefs[extras]`. - **NEW**: Remove `version` and `__version__` and remove associated deprecation code.
4.2.1
- **FIX**: Fix Python 3.8 installation issue due to Unicode bundle having an incorrect encoding in some files.
4.2.0
- **NEW**: Deprecate the **search** references `\l`, `\L`, `\c`, and `\C`. The POSIX alternatives (which these were shortcuts for) should be used instead: `[[:lower:]]`, `[[:^lower:]]`, `[:upper:]]`, and `[[:^upper:]]` respectively. - **NEW**: Formally drop support for Python 3.4.
4.1.1
- **FIX**: Later pre-release versions of Python 3.8 will support Unicode 12.1.0.