regexrs

Leverages the Rust regex crate with PyO3 to create an interface similar to the Python standard library re module.

>>> import regexrs as re
>>> pattern = re.compile(r'(\w+) (\w+)')
>>> m = pattern.match('hello rust')
>>> m.groups()
('hello', 'rust')
>>> m.pos
0
>>> m.endpos
10

How to install from source

You can use pip to build and install.

pip install .

If you want to build manually:

pip install maturin
maturin build --release

Status

Mostly incomplete and likely very buggy. I am using this mostly as an exercise in creating and distributing Python extensions using Rust and PyO3. It's unclear if this will ever be a particularly useful project or not. If you're looking for a complete and performant regex library for Python today, see the regex project on PyPI.

Differences compared to standard lib:

• The endpos argument normally found in the re module is not supported in regexrs for the match/search/findall/finditer methods.
• Some regex features are not supported (because they are not supported by the regex crate), such as lookarounds and backreferences.
• Until a future release, flags are expected to be part of your pattern. For example, instead of passing re.I for case-insensitive patterns or other flags, you would write these flags inline like (?i) at the beginning of your pattern.
• Until a future release, there is no cache for avoiding re-compiling the same patterns multiple times