A comprehensive guide and utility for writing efficient, secure, and cross-engine compatible regular expressions.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install regex
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install regex using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Regex Expert?
Regular expressions are essential for modern development, yet their implementation varies wildly across different programming environments. This skill, integrated within the Openclaw Skills ecosystem, provides a technical framework for writing precise patterns tailored to specific engines like JavaScript, Python, PCRE, and Go. It bridges the gap between simple string matching and complex text processing by detailing advanced concepts such as lookahead assertions, non-capturing groups, and engine-specific flags.
By using this skill, developers can ensure their patterns are optimized for performance and security. It focuses on the technical nuances of greedy versus lazy matching and provides the knowledge necessary to prevent common issues like catastrophic backtracking. Openclaw Skills empowers developers to handle everything from simple validation to complex data extraction with professional-grade regex logic.
Regex Expert Use Cases
- Validating user input formats for consistency across different backend and frontend engines.
- Extracting specific data points from large volumes of unstructured log files or text data.
- Implementing complex search-and-replace operations during large-scale code refactoring.
- Securing applications by properly escaping user-provided input within dynamic regex patterns.
- Improving search efficiency in data-heavy applications by using anchored patterns and atomic groups.
How Regex Expert Works
- Define the search objective and identify the specific regex engine used by your environment (e.g., V8, RE2, or PCRE).
- Select appropriate anchors and character classes to define the boundaries and content of the match.
- Apply quantifiers, choosing between greedy or lazy behavior depending on whether you need the maximum or minimum possible match.
- Organize the pattern using capturing or non-capturing groups to facilitate data extraction or logical scope.
- Optimize the pattern for performance by avoiding nested quantifiers and utilizing possessive quantifiers where supported.
- Validate the final pattern against edge cases, including empty strings and special characters, within the Openclaw Skills workflow.
Regex Expert Setup
To integrate this skill into your development environment, ensure you have the Openclaw Skills framework installed and configured.
# Add the regex skill to your local registry
openclaw install regex-expert
# Configure the default engine for your project
openclaw config regex --engine=javascript
Regex Expert Data Schema & Taxonomy
The Regex skill organizes patterns and metadata into a structured format to ensure cross-engine compatibility.
| Feature | Component | Description |
|---|---|---|
| Boundary | Anchors | Defines start (^), end ($), and word boundaries (\b). |
| Selection | Classes | Defines character sets ([abc]) and shorthands (\d, \w). |
| Logic | Groups | Handles capturing (()), non-capturing ((?:)), and named groups. |
| Assertions | Lookarounds | Validates context without consuming characters ((?=...), (?<=...)). |
| Modifiers | Flags | Controls global (g), case-insensitive (i), and multiline (m) modes. |
Regex Expert Advanced Features
- Engine-specific compatibility checks for JavaScript, Python, PCRE, and Go.
- Analysis of catastrophic backtracking risks to prevent ReDoS (Regular Expression Denial of Service) attacks.
- Support for advanced PCRE features like possessive quantifiers and recursive patterns.
- Unicode support for handling international character sets and surrogate pairs.
- Performance optimization tips for unanchored versus anchored pattern matching within Openclaw Skills.
SKILL.md
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