Regex-LE MCP server
Extract regular expressions from code, each with a ReDoS safety verdict.
2 stars41 downloads/wk
Reviews
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If you have run it, two minutes of your experience saves the next person an afternoon.
Regex-LE tools (1)
write = sends, deletes, buys or postsRead from the package source without running it. The installed server may list more.
extract_patternsExtract every regular expression from source code \u2014 JavaScript and TypeScript literals and RegExp constructors, and the call sites Python, Rust, Go, Java, Ruby, PHP and C# write a pattern at \u2014 with its flags, 1-based position, and a ReDoS verdict saying whether the pattern can be driven into catastrophic backtracking. Duplicate pattern-and-flags pairs are reported once, at first occurren
Public scan report
scanner v0.1.9 · 2026-09-23 · same rubric, same numbers if you re-run it
- Code scan2 source files scanned25/25
- –Live reliabilityno gateway calls yet and no remote to proben/a
- –Tool poisoningtools not inspected (local package is not executed); not countedn/a
- Auth qualitylocal package, no credentials required12/15
- Maintenancelast push 1 days ago15/15
- Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
What the publisher says
From the Regex-LE repository's README, as published. We do not edit it. Read it on GitHub
Regex-LE: Zero Hassle Regex Extraction & Validation Find, test, and validate the regex patterns in the current file Literal patterns, RegExp constructors, ReDoS screening
Useful? A star or rating is how other developers find it —
★ GitHub ·
★ Open VSX ·
★ Marketplace
What it does
Open any file and run one of three commands. Extract lists every regex pattern found in the document. Test (Ctrl+Alt+R / Cmd+Alt+R) runs a found — or manually entered — pattern against the file content and reports matches with real line/column positions and capture groups (named groups included). Validate checks every found pattern for syntax errors and screens it for catastrophic backtracking, reporting the input that causes it. Works in VS Code and VS Code–based editors like Cursor and VSCodium (installable from Open VSX).
Install
Use it from an AI agent
The same engine runs as an MCP server, so an agent can call it directly instead of you running a command.
extract_patterns(content, format?, filename?, maxResults?)Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Install directly
Runs npx -y regex-le-mcp on your machine. Read the scan report first; the gateway never runs local packages.
claude mcp add regex-le -- npx -y regex-le-mcp
Regex-LE: common questions
- Is Regex-LE MCP server safe?
- Yes, by our scan: it is graded A (92/100). Read the Regex-LE safety report
- How do I install Regex-LE?
- It runs on your machine. Copy the Claude Code, Claude Desktop or Cursor config from the install section.
- Does Regex-LE need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Regex-LE maintained?
- The last commit was 2 days ago (2026-09-22). The latest release is v2.3.0.
- What can I use instead of Regex-LE?
- Servers from other publishers that do the same job: Brightdata MCP server, Openbrowser AI MCP server and Zenrows MCP server. Compare all Regex-LE alternatives.
Alternatives to Regex-LE
Same job from other publishers: the closest match first, then the best rated.
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