Regex Pattern Validator
Expert regex architect for building, auditing, and optimizing high-performance, ReDoS-safe patterns.
Free
Works with the AI tools you already use
regex-pattern-validator
Example session with this skill installed
Create a regex pattern for a product code that starts with three lowercase letters, a hyphen, and four digits. Include named groups for id and val and check for ReDoS.
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- Compiled the regex-pattern-validator
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About this skill
What it does
The Regex Pattern Validator is a specialized skill for developing, testing, and auditing regular expressions across multiple programming languages. It goes beyond simple string matching by providing deep performance analysis, ReDoS (Regular Expression Denial of Service) protection, and engine-specific compatibility checks.
Why use this skill
Writing regex is easy; writing safe, performant, and cross-platform regex is hard. This skill prevents production outages caused by catastrophic backtracking and ensures your patterns work identically in JavaScript, Python, Go, Java, and PCRE. It automates the tedious process of generating comprehensive test tables for happy paths, boundary cases, and malicious inputs.
Supported Engines & Tools
- Flavors: Full support for PCRE, JavaScript (ES6+), Python (re/regex), Go (regexp), and Java patterns.
- Security: Built-in auditing for ReDoS vulnerabilities like nested quantifiers and ambiguous alternations.
- Codebase Integration: Can scan your entire repository to find and audit existing regex patterns for risks.
- Library: Access to 30+ production-ready patterns for emails, URLs, semver, and more.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
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- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
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Click the path to copy it. Create the folder if it does not exist yet.
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