What is openclaw-regex-engine?

A regular-expression toolkit for testing, explaining, creating, finding, and replacing text patterns. A regular expression is a compact pattern used to search or validate text.

Use it to test a pattern against text, explain an existing pattern, create one from a plain-language description, browse standard patterns, or replace matched text using captured parts.

It helps when patterns are difficult to write or understand, especially in older code or when a pattern uses capture groups and other advanced syntax.

openclaw-regex-engine — Skill by yedanyagamiai-cmd

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add yedanyagamiai-cmd/openclaw-mcp-servers --skill regex-engine

Clone the repo

git clone --depth 1 https://github.com/yedanyagamiai-cmd/openclaw-mcp-servers

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/yedanyagamiai-cmd/openclaw-mcp-servers/regex-engine/github.svg)](https://agentmods.dev/skills/yedanyagamiai-cmd/openclaw-mcp-servers/regex-engine)

Your own site

<a href="https://agentmods.dev/skills/yedanyagamiai-cmd/openclaw-mcp-servers/regex-engine"><img src="https://agentmods.dev/badge/skills/yedanyagamiai-cmd/openclaw-mcp-servers/regex-engine/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/yedanyagamiai-cmd/openclaw-mcp-servers/regex-engine"><img src="https://agentmods.dev/badge/skills/yedanyagamiai-cmd/openclaw-mcp-servers/regex-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 183 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,762 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00183	$0.02762
Opus 5.5	$0.00073	$0.01105
Sonnet 5.5	$0.00037	$0.00552
Haiku 4.5	$0.00018	$0.00276

Measured 1mo ago against content hash 3c2fe780f20f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

openclaw-regex-engine scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

clawhub-skills/regex-engine/SKILL.md · 218 lines

How it starts

The opening of the file, as written. The whole thing — 218 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenClaw Regex Engine v2.0

Master regular expressions -- 5 tools to test, explain, build, browse, and replace patterns instantly.

Quick Reference

Situation	Action	Tool
Have a regex, need to test it	Run against text, get all matches + groups	`regex_test`
Found a scary regex in legacy code	Get plain-English breakdown of every token	`regex_explain`
Know WHAT to match but not HOW	Describe in English, get production regex	`regex_build`
Need a standard pattern (email, URL, IP)	Browse 50+ battle-tested patterns	`regex_library`
Need to transform text with regex	Find-replace with backreferences ($1, $2)	`regex_replace`
Complex pattern with capture groups	Test + Explain combo for full understanding	`regex_test` + `regex_explain`

What's New in v2.0

:brain: PatternForge Builder -- Describe what you want in plain English. Get a production-ready regex with positive/negative test cases, flags, and explanation included.
:book: RegexLens Explainer -- Break any regex into human-readable components token-by-token. Even nested lookaheads, possessive quantifiers, and Unicode categories.
:file_cabinet: BattleTest Library -- 50+ curated patterns for email, URL, phone (international), IPv4/IPv6, UUID, JWT, credit card, date formats, file paths, and more. Every pattern includes test cases.
:arrows_counterclockwise: SmartReplace Engine -- Full backreference support including named groups, global/first-match modes, and before/after diff preview.

MCP Quick Start

{
  "openclaw-regex": {
    "type": "streamable-http",
    "url": "https://regex-engine-mcp.yagami8095.workers.dev/mcp"
  }
}

Add to Claude Desktop, Cursor, Windsurf, VS Code, or any MCP-compatible client. No API key needed for Free tier. Works immediately.

Detection Triggers

This skill activates when you say:

"test this regex" / "does this pattern match" / "run this regex against"
"explain this regex" / "what does this regex do" / "break down this pattern"
"build a regex for" / "create a pattern that matches" / "regex for emails"
"regex for URL" / "phone number regex" / "UUID pattern" / "IP address regex"
"regex replace" / "find and replace with regex" / "search and replace with capture groups"
"regular expression" / "pattern matching" / "capture groups" / "backreference"

Read the full file on GitHub · 218 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 218 lines · 183 tokens per session scan A 3c2fe780f20f

Subscribe to this mod's changes

openclaw-regex-engine is a skill published in the GitHub repository yedanyagamiai-cmd/openclaw-mcp-servers (4 stars, last pushed 7mo ago), licensed MIT. It adds 183 tokens to every session and 2,762 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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openclaw-regex-engine