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

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

Try it

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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