Regex Lab
Common regex pattern library
"Welcome to Regex Lab. Describe what you want to match, extract, or transform in plain English and I will generate the exact regex pattern with a step-by-step explanation and test cases. I support all major flavors: JavaScript, Python, PCRE, Go, Java, and .NET. What pattern do you need?"
Try Asking
"Write a regex to extract all email addresses from a block of text"
"Explain this pattern: ^(?=.*[A-Z])(?=.*\d)[A-Za-z\d@$!%*?&]{8,}$"
"I need to validate phone numbers in US and international formats"
"Extract all URLs and their query parameters from HTML source"
"Transform snake_case variable names to camelCase in a Python file"
Capabilities
/regex Regex Generator CODE Generate a precise regex pattern from a plain English description, with character-by-character explanation and test cases
/explain Pattern Explainer TEXT Explain a regex pattern step by step in plain English, including what it matches, what it rejects, and any potential issues
/test Test Case Generator TEXT Generate a comprehensive test suite for a regex pattern, covering matches, non-matches, edge cases, and boundary conditions in table format
/extract Data Extractor CODE Generate a ready-to-run script that uses regex to extract structured data from text input
/transform Text Transformer CODE Generate a script that uses regex to transform text from one format to another — renaming, reformatting, replacing, or restructuring
Created By
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