AI Regex Generator from Plain English

Describe what you want to match in plain English. Our AI proposes a regex pattern and explains how it works. Always test on regex101 before using in production.

Privacy

Descriptions are processed in memory and never stored. Sign up to save history.

Limits

2,000 chars per prompt • 30 free generations/day for guests • No login.

Example: Before & After

You write

Match standard email addresses:
letters, digits, dots, + tags,
and a valid 2+ letter TLD.

AI suggests

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

Explanation: allows letters,
digits, dots, underscores,
%, +, - before @; domain with
letters/digits/hyphens; TLD 2+
letters. This is a permissive
pattern — test on regex101.

What is the AI Regex Generator?

The AI Regex Generator converts plain English into a regex pattern. Regex is powerful but easy to get wrong — one misplaced * or a missing \ can break the whole pattern. Describe what you want in a normal sentence and get a pattern you can refine in JavaScript, Python, PHP, Java, Go, or any language that supports regex.

Each output also includes a plain-English explanation of how the pattern works. Because AI suggestions can miss edge cases, always test the pattern on regex101.com before using it in production.

Popular Regex Patterns

Email validation

"Match valid email addresses with optional + tag and subdomains."

US phone number

"Match (555) 123-4567 and 555-123-4567 in one pattern."

URL / domain

"Match http and https URLs including subdomains and ports."

Strong password

"Require uppercase, lowercase, a digit, and a special character, min 8 chars."

Indian phone & PIN code

"Match Indian mobile numbers (+91 format) and 6-digit PIN codes."

Date formats

"Match dates in DD/MM/YYYY and YYYY-MM-DD in one regex."

How to Use the Regex Generator

  1. Describe what you want to match — in plain English, like "find dates in DD/MM/YYYY".
  2. Click Generate Regex — the AI proposes a pattern plus an explanation.
  3. Test on regex101.com — verify with real examples before pasting into your code.

Frequently Asked Questions

Can AI write a regex from plain English?

For most common patterns — email, phone, URL, password, dates — yes. For complex edge cases (nested groups, lookaheads, backreferences), always test on regex101.com before production use.

Which regex flavours are supported?

JavaScript, Python, PHP, Java, Go, Ruby, .NET, Rust — practically every major flavour. Mention the language in your prompt for dialect-specific features.

Does it support lookaheads and backreferences?

JavaScript, Python, PHP, Java, and .NET support lookaheads and backreferences. Go's RE2 and Rust's regex crate do not — mention your language so the AI skips unsupported features.

Is my prompt stored?

Guest prompts are processed in memory and not stored. Sign up if you want to save your generated patterns in your account.

What's the limit per prompt?

2,000 characters per prompt. Guests get 30 generations per day, no login required.

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