grex Regular Expression Generator from Test Cases

grex is a command-line tool and library that automatically generates regular expressions from user-provided test cases. Written in Rust with Python bindings, it produces the most specific regex that matches the given input, supporting Unicode 16.0, character class detection, quantifier notation, and case-insensitive matching.

Installation

Use the upstream install or setup path that matches your environment:

• git clone https://github.com/pemistahl/grex.git
• cargo build
• cargo test
• cargo bench

Requirements and caveats from upstream:

• 
• 
• Specifies the minimum length a repeated substring must have in order to be converted if

Basic usage or getting-started notes:

• Input:

• [INPUT]... One or more test cases separated by blank space

• -f, --file <FILE> Reads test cases on separate lines from a file

• Source: https://github.com/pemistahl/grex

• Extracted from upstream docs: https://raw.githubusercontent.com/pemistahl/grex/HEAD/README.md

Source

• Agent Skill Exchange