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ripgrep (rg)

What it is

ripgrep (rg) is a line-oriented search tool that recursively searches your current directory for a regex pattern while respecting your gitignore.

What problem it solves

It provides extremely fast searching capabilities across large codebases. It is often used by AI agents to quickly find relevant code blocks or configuration files within a repository.

Where it fits in the stack

[Utility / CLI Tool] - A high-speed search utility often exposed to AI agents via tools or MCP servers.

Typical use cases

  • Searching for specific strings or patterns in a large repository.
  • Filtering files by type or content.
  • Integration into IDEs or AI agents for codebase navigation.

Strengths

  • Performance: Often faster than other search tools like grep, ack, or ag.
  • Smart Defaults: Respects .gitignore and ignores hidden files/binary files by default.
  • Cross-platform: Works on Windows, macOS, and Linux.

Limitations

  • CLI-focused: Primarily a command-line tool, though libraries and integrations exist.
  • Not for Binary Analysis: Designed for text files, not suitable for searching inside binary blobs.

When to use it

  • When you need to find text in a large project quickly.
  • When building tools that need to provide search functionality to an AI agent.

When not to use it

  • For simple searches in a single, small file where standard grep is already available.
  • If you need full-text indexing and semantic search (use a Vector DB instead).

CLI examples

# Search for "FastAPI" in the current directory
rg "FastAPI"

# Search for "TODO" in .md files only
rg -t md "TODO"

# Search and replace (using sed-like output)
rg 'pattern' --replace 'replacement'

Getting started

Installation

# macOS (Homebrew)
brew install ripgrep

# Ubuntu/Debian
sudo apt-get install ripgrep

Licensing and cost

  • Open Source: Yes (MIT License)
  • Cost: Free
  • Self-hostable: Yes

Sources / References

Contribution Metadata

  • Last reviewed: 2026-03-19
  • Confidence: high