Regex Generator — Visual Builder, Example Inference & AI Generator

100% In-Browser. No network requests.

Visual Block Builder

Anchors: Starts with line (^) Ends with line ($) Word boundary (\b)

Insert Common Presets:

Heuristic Example Inference

Must Match (1 per line):

Must NOT Match (optional):

Validation against examples:

💡 Heuristic inference detects structural token sequences (digits, uppercase letters, delimiters). Best suited for structured codes and IDs.

Natural Language AI Generator Direct Client-Side Fetch

Describe what you want to match in plain English:

Provider:

API Key (Session Only):

Key is stored in browser memory only and sent directly to the provider.

Generated Regular Expression

/ / g

Flags: g (global) i (ignore case) m (multiline) s (dotAll)

Live Match Tester 0 matches

Pattern Breakdown & Explanation 0 tokens