wtf is re2c?

re2c is a tool that helps programmers build "lexers", the part of a program that breaks raw text into meaningful chunks, like splitting a sentence into individual words or recognizing keywords in code. It supports C/C++, Go, and Rust, and its main selling point is speed: it generates lexers that are at least as fast as ones a programmer would carefully write by hand. Here is how it works at a high level. You describe the patterns you want to match in your text using simple rules, and the tool generates the matching code for you. What makes this project different is that instead of looking up patterns in a large reference table (which is how many similar tools work), it translates your rules directly into straightforward if-then logic and comparisons. This approach makes the resulting program faster, smaller, and easier for a programmer to debug and understand. Someone building a programming language, a configuration file parser, or a custom search feature would use this. For example, if you are creating your own programming language, you need a way to read the source code file and identify the individual commands, variables, and symbols, this tool automates that step. The README notes that it has a flexible interface, meaning the programmer keeps control over most of the surrounding code rather than being locked into a rigid template. The project has been around for a long time. It was originally written by Peter Bumbulis and is now maintained by Ulya Trofimovich, with contributions from many volunteers over the years. It is a community-driven open source project with documentation and examples available on its official website.