# Regular Expressions

> Designing, parsing, and searching string parameters using Python regular expressions.

- Skill: `lord1egypt/regular-expressions-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add lord1egypt/regular-expressions-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/lord1egypt/regular-expressions-2/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT license
- Author: Lord1Egypt (https://skillmd.com/u/lord1egypt)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/lord1egypt/regular-expressions-2

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# Regular Expressions

## Overview
Regular Expressions (Regex) define search patterns to extract or validate matching parts of texts.

## When to Use This Skill
Use to extract emails, parse URLs, clean user inputs, or extract variables from raw HTML.

## Quick Start (with runnable code examples)

```python
import re

text = "Find me at akim.221992@gmail.com and also lordegypt@github.com"
# Extract all email patterns
emails = re.findall(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', text)
print("Emails found:", emails)
```

## Advanced Usage
Design complex regex configurations with named lookarounds, non-capturing groups, and multi-line flag patterns.

## Key References
- [Python re module documentation](https://docs.python.org/3/library/re.html)

## Dependencies
- Python Standard Library