JavaScript Regex Tester

Try a pattern on your text and review matching or replacement results. Optional AI assistance sends the description, pattern and flags to DeepSeek after confirmation.

AI Assist · optional

Build and debug a regex from intent

Describe the matching rule or inspect the current pattern. Your tester text remains local.

DeepSeek API

1 · Intent

Current pattern —

What should the pattern match?

What is sent: Only this description, the current regex, and its flags are sent to DeepSeek. Text in the Regex Tester is never included. Privacy details

2 · Suggested pattern

The suggested pattern, explanation, and synthetic checks will appear here. Nothing is sent until you confirm.

Quick patterns: Email address HTTP URL IPv4 address UUID ISO date 24-hour time Hex color Integer Decimal number Outer whitespace URL slug Semantic version

Regular expression

Global search Ignore case Multiline Dot matches newline Unicode

Replace with

Replace matches