Installation

Overview

Backrefs is a wrapper around Python's built-in Re and the 3^rd party Regex library. Backrefs adds various additional back references (and a couple other features) that are known to some regular expression engines, but not to Python's Re and/or Regex. The supported references actually vary depending on the regular expression engine being used as the engine may already have support for some, or things that prevent implementation of a feature.

Backrefs comes in two flavors: bre (a Re wrapper) and bregex (a Regex wrapper).

Installation

There are a couple of recommended ways to install Backrefs.

1. Install with pip:

   $ pip install backrefs
   

2. Install with optional requirement regex:

   $ pip install backrefs[extras]
   

3. Install locally from source via:

   $ python setup.py build
   $ python setup.py install
   

4. If developing Backrefs, you can install via:

   $ pip install --editable .
   

   This method will allow you to instantly see your changes without reinstalling which is great for developing.