Form Validation Regex AI

Easily generate regex patterns for emails, passwords, phone numbers, URLs, and IP addresses.

AI Core

Regex Builder AI

Generate regex patterns for validation, extraction, and replacement scenarios.

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Is the Regex Validation Pattern Builder free to use?

Yes, our AI-powered tool is entirely free to use directly in your browser without any required sign-ups.

Explore the most common scenarios for Regex Builder AI below. Each page is a focused calculator with worked examples and edge-case guidance.

Generate regular expressions for JavaScript validation, matching, and replacing using natural language.

Write complex Python (re module) regex patterns instantly by simply describing what you want to extract.

Confused by a regular expression? Paste it here and AI will explain exactly what it matches and why.

Easily generate regex patterns for emails, passwords, phone numbers, URLs, and IP addresses.

Regex Tester

Test regular expressions with live match highlighting and capture groups.

JSON Schema AI

Generate JSON Schema draft 2020-12 with validation constraints for API and data pipelines.

SQL Query AI

Generate production-ready SQL queries from plain-language analytics tasks.

Cron Validator

Validate cron expressions, see next run times, and field breakdown.