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Regex Builder

Build and test regular expressions with multi-language syntax support. Create complex patterns, validate against sample data, and explain regex in plain English.

Build, test, and understand regular expressions across multiple programming languages. Construct complex regex patterns, test them against sample data, translate patterns into plain-English explanations, and access a common-pattern library for frequently used validations.

regexpatternsvalidationparsing
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Version 1.0.0Updated Jan 27, 2026

Capabilities

Build complex regex patterns
Test against sample data
Explain regex in plain English
Common-pattern library
Multi-language syntax support

Use cases

Data validation
Text parsing and extraction
Search and replace operations
Input sanitization
Log file analysis

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Example prompts to use with this skill

Prompt

Create a regex pattern to validate email addresses

Output
Here's a regex pattern for email validation:
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
**Explanation:** - `^` - Start of string - `[a-zA-Z0-9._%+-]+` - One or more letters, numbers, or special chars (., _, %, +, -) - `@` - Literal @ symbol - `[a-zA-Z0-9.-]+` - Domain name with letters, numbers, dots, hyphens - `\.` - Literal dot - `[a-zA-Z]{2,}` - Top-level domain (2+ letters) - `$` - End of string **Test cases:** ✓ user@example.com ✓ john.doe+filter@company.co.uk ✗ invalid@ ✗ @example.com
Prompt

Extract all URLs from text using regex

Output
Pattern to extract URLs:
https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&\/\/=]*)
**Usage in JavaScript:**
const text = "Visit https://example.com or http://test.org";
const urlRegex = /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&\/\/=]*)/g;
const urls = text.match(urlRegex);
console.log(urls); // ['https://example.com', 'http://test.org']
**Python:**
import re
text = "Visit https://example.com or http://test.org"
pattern = r'https?://(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)'
urls = re.findall(pattern, text)
print(urls)

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