Python's Regex module--a more powerful regular expression engine (not yet ready to write)

Python has its own regular expression engine (built-in re module), but the supported features are thin, and none of the following features are supported:

• Curing Group Atomic Grouping
• Occupy priority quantifier possessive quantifiers
• Variable length reverse-order surround Variable-length Lookbehind
• Recursive matching Recursive patterns

Matthew Barnett wrote a more powerful regular expression engine-theregex module for Python-that could replace the built-in re module. In addition to some of the features mentioned above, there are many new things.

Let's start with the Regex installation, which you can do at the command line:

Install Regex

The regex is divided into version 0 and version 1 Two working modes, where version 0 is compatible with existing RE modules:

	Version 0 (re-module compatible)	Version 1
Enable method	Set up. VERSION0 or. V0 flag, or write in an expression (? V0). If no settings are made, the default is version 0.	Set up. VERSION1 or. V1 flag, or write in an expression (? V1).
Behavior of the. Split ()	You cannot cut a string at a 0 wide match .	You can cut a string at a 0 wide match .
0 wide Match	Treated like re.	Handled like Perl and PCRE .
The identity inside the expression	Only works on the entire expression and cannot be closed.	Can be applied to an entire or partial expression and can be closed.
Character groups	Only simple character groups are supported.	Groups of characters can have nested sets, or can do set operations (set, intersection, difference set, symmetric difference set).
Character case	Only simple case is supported by default.	The capitalization of all Unicode characters is supported by default.

Python's Regex module--a more powerful regular expression engine (not yet ready to write)