grex ☆

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Description:
Command-line tool for generating regular expressions

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: regex cli developer-tools rust productivity

Install: brew install grex

About:
Grex is a command-line utility designed to generate regular expressions from user-provided test cases. It automates the complex task of writing regex patterns by analyzing input strings and producing the most concise expression that matches them. This tool significantly speeds up development workflows for developers who need to create or understand regex patterns quickly.

Key Features:

Generates regex from example strings
Supports Unicode and escape sequences
Produces optimized and readable patterns
Can be used as a CLI tool or Rust library

Use Cases:

Quickly creating regex patterns for data validation without manual crafting
Reverse-engineering existing regex patterns from sample inputs
Learning how regular expressions work by seeing them generated from examples

Alternatives:

Regex101 – Regex101 is a web-based tester/debugger, whereas Grex is a CLI tool that generates patterns from scratch.
Regexper – Regexper visualizes existing regex patterns, while Grex creates the pattern code based on input data.

Version History

Detected	Version	Rev	Change	Commit
Sep 12, 2025 3:17pm		0	VERSION_BUMP	4c949972
Sep 13, 2024 12:15pm		0	VERSION_BUMP	442af4d1