The unreasonable effectiveness of f-strings and re.VERBOSE
... in which we look at one or two ways to make life easier when working with Python regular expressions. tl;dr: You can compose verbose regular expressions using f-strings. Here's a real-world example – instead of this: 1pattern = r"((?:\(\s*)?[A-Z]*H\d+[a-z]*(?:\s*\+\s*[A-Z]*H\d+[a-z]*)*(?:\s*[\):+])?)(.*?)(?=(?:\(\s*)?[A-Z]*H\d+[a-z]*(?:\s*\+\s*[A-Z]*H\d+[a-z]*)*(?:\s*[\):+])?(?![^\w\s])|$)"
GitHub - pemistahl/grex: A command-line tool and Rust library with Python bindings for generating regular expressions from user-provided test cases
grex is a library as well as a command-line utility that is meant to simplify the often complicated and tedious task of creating regular expressions. It does so by automatically generating a single regular expression from user-provided test cases. The resulting expression is guaranteed to match the test cases which it was generated from. This project has started as a Rust port of the JavaScript to
GitHub - axiak/pyre2: Python wrapper for RE2
Summary pyre2 is a Python extension that wraps Google's RE2 regular expression library. This version of pyre2 is similar to the one you'd find at facebook's github repository except that the stated goal of this version is to be a drop-in replacement for the re module. Backwards Compatibility The stated goal of this module is to be a drop-in replacement for re. My hope is that some will be able to
ReDoS - Wikipedia
A regular expression denial of service (ReDoS)[1] is an algorithmic complexity attack that produces a denial-of-service by providing a regular expression and/or an input that takes a long time to evaluate. The attack exploits the fact that many[2] regular expression implementations have super-linear worst-case complexity; on certain regex-input pairs, the time taken can grow polynomially or expone
Ragel State Machine Compiler
Ragel compiles executable finite state machines from regular languages. Ragel targets C, C++ and ASM. Ragel state machines can not only recognize byte sequences as regular expression machines do, but can also execute code at arbitrary points in the recognition of a regular language. Code embedding is done using inline operators that do not disrupt the regular language syntax. The core language con
re2 - Project Hosting on Google Code
This is the source code repository for RE2, a regular expression library. For documentation about how to install and use RE2, visit https://github.com/google/re2/. The short version is: make make test make install make testinstall Building RE2 requires Abseil (https://github.com/abseil/abseil-cpp) to be installed on your system. Building the testing for RE2 requires GoogleTest (https://github.com/
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