The best grep and ripgrep alternatives for AI coding agents in 2026

TL;DR — For a one-off literal search, ripgrep is still the right tool, and nothing here replaces it. The alternatives win different jobs: ugrep for Boolean and fuzzy queries, ast-grep and Semgrep for syntax patterns, zoekt for a ranked index over many repositories, XERJ for ranked passages behind an MCP server.

Pick one in ten seconds

• Pick ripgrep if the agent needs a literal or regex search once. It needs no index, so it is never stale.
• Pick ugrep if you want a grep with Boolean AND/OR/NOT queries, fuzzy matches, or search inside archives and PDFs.
• Pick ast-grep if the question is a syntax pattern, or the agent must rewrite every match.
• Pick Semgrep if the patterns are security or correctness rules and you want them as an MCP tool.
• Pick zoekt if you need a ranked, always-on trigram index across many repositories.
• Pick The Silver Searcher only if it is already in your scripts. ripgrep and ugrep do the same job and still ship releases.
• Pick XERJ if the agent asks one tree many questions and should get a few ranked passages with file:line, not every matching line.

Summary table

ripgrep: still the default

ripgrep searches files directly, so there is no index to build or keep fresh. For an agent, that means a fresh answer on every call. Choose ripgrep when the agent searches a tree once or twice; use grep when nothing else is installed, because it ships with almost every system.

It beats XERJ on real tasks. On one 331-file tree the two tools named the same files on 18 of 30 disclosed tasks, and ripgrep 14.1.1 won 5 outright, including a substring inside an identifier that the index missed (XERJ vs ripgrep).

ugrep: grep with Boolean and fuzzy queries

ugrep accepts Google-like Boolean patterns, fuzzy matches, and searches inside zip, tar and compressed files, and PDF and Office documents. Its optional indexer speeds up slow or cold file systems.

It still prints every match in file order, so a common term still floods the agent's context.

ast-grep and Semgrep: syntax, not text

ast-grep parses code with tree-sitter and matches patterns such as "every unwrap() inside a loop", and can rewrite each match. Semgrep matches rule patterns aimed at security and correctness, and ships an MCP server that coding assistants can call directly.

Both answer questions that no text search answers well. Choose ast-grep when the agent must find or rewrite a syntax shape; choose Semgrep when the shape is a security rule. Use them beside a search tool, not instead of one. XERJ vs ast-grep splits those jobs.

zoekt: a ranked trigram index

zoekt builds a trigram index and ranks matches, with ctags symbol information as a key ranking signal. Its README describes it as fast search across many repositories in a large codebase, with an index server and web server for larger-scale use.

It has no MCP server and no GitHub release; you install it with go install. It indexes code, not the docs and data files around it.

The Silver Searcher: superseded

ag was the fast grep before ripgrep. Its last push was on 2024-06-16 and it has no GitHub release. It still works, but nothing on this page needs it.

XERJ: ranked passages behind MCP

XERJ indexes a repository plus the docs, logs, JSONL and CSV files around it, and xerj mcp returns ranked passages with file:line. In one psf/requests capture an answer was 1,303 bytes where rg printed 25,150 (the capture).

What it gives up: an index to build and keep fresh, no syntax rewriting, single-node only, and the 5 tasks ripgrep won above.

How this page was checked

Every licence, install line and capability above was read from the project's own README on 2026-10-19. Stars, latest releases and last-push dates came from the GitHub REST API the same day. No new benchmark was run for this page; the two XERJ numbers link to their published captures.

FAQ

Is there a ripgrep alternative that ranks results?

ripgrep, ugrep and ag print every match in file order; none of them ranks. zoekt ranks matches over a trigram index and uses ctags symbols as a ranking signal. XERJ ranks passages with BM25 over an index and returns file:line for each hit.

Should a coding agent stop using ripgrep?

No. On one 331-file tree ripgrep won 5 of 30 disclosed tasks outright against the XERJ index, including a substring inside an identifier. Keep ripgrep for one-off literal searches and add an index when the agent asks the same tree many questions.

Which tool finds syntax patterns instead of text?

ast-grep matches tree-sitter patterns and rewrites code; Semgrep matches rule patterns for security and correctness and runs as an MCP server. Neither builds a search index, so neither goes stale.

Which of these work as an MCP server?

Semgrep (semgrep mcp), ast-grep through the separate ast-grep MCP project, and XERJ (xerj mcp). ripgrep, ugrep, zoekt and ag are command-line tools an agent calls through its shell.

Is The Silver Searcher still maintained?

Its last push on GitHub was on 2024-06-16 and it has no GitHub release, as read from the GitHub API on 2026-10-19. ripgrep and ugrep cover the same job and ship regular releases.

Were these tools benchmarked against each other?

No head-to-head benchmark was run for this page. The ripgrep numbers come from the published 30-task comparison and the 1,303-byte answer from the psf/requests capture, both linked on this page.

Evidence

• ripgrep installs with brew install ripgrep, apt-get install ripgrep or cargo install ripgrep. — https://github.com/BurntSushi/ripgrep
• ugrep supports Google-like Boolean query patterns with AND, OR and NOT, fuzzy search, searching archives and compressed files, searching PDF and Office documents, and includes a file indexer for slow and cold file systems. — https://github.com/Genivia/ugrep
• ast-grep installs with brew install ast-grep or cargo install ast-grep --locked. — https://github.com/ast-grep/ast-grep
• Semgrep ships an MCP server that lets AI coding assistants run Semgrep scans; semgrep mcp starts it locally. — https://github.com/semgrep/semgrep
• zoekt is based on trigram indexing and syntactic parsing, installs with go install, and recommends Universal ctags because symbol information is a key signal in ranking search results. — https://github.com/sourcegraph/zoekt
• On one 331-file code tree ripgrep and the XERJ index named the same files on 18 of 30 disclosed tasks, and ripgrep 14.1.1 won 5 outright. — /compare/xerj-vs-ripgrep-for-code-agents
• On psf/requests one XERJ answer was 1,303 bytes where rg printed 25,150. — /answers/local-code-search-mcp-fewer-tokens-than-grep

Related

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• ast-grep vs a code index for an agent?
• Local code search MCP for Claude Code that uses fewer tokens than grep
• The best MCP servers for searching a local codebase in 2026
• I need my agent to find a passage and cite the file, not dump the whole tree. How? · same intent: code search for agents
• How do I audit a PHP codebase with an index instead of grepping 1,400 files? · same intent: code search for agents
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