Visual Regex Builder & Tester

Build regular expressions with visual rules, repetition controls and presets. Test matches and capture groups before copying your JavaScript regex.

Hover over or focus a field for help. Press Escape to close.

Start from a preset

Arrange rules from left to right. Presets check structure, not semantic validity.

Rule 1ConditionRepetitionMinimum / countCapture group

Rule 2ConditionRepetitionMinimum / countCapture group

Must contain (one literal per line; entire input only)Must not contain

Generated JavaScript regex

/^((?:[A-Za-z]){2})((?:[0-9]){3})$/gu

Test text (max 20,000 characters)

Testing…

AB123

How it works

Add and order rules, then test the regex against sample text. Copy or download the generated expression. Reset restores the initial preset.

A practical example

Test text (max 20,000 characters)

AB123

Frequently asked questions

Is my input sent to a server?

No. Your content is processed in this browser. It is never sent to the server or saved.

What should I know about Visual Regex Builder & Tester?

Add rules in order, set repetitions and optional capture groups, then test sample text. Include/exclude conditions operate over the complete input. Presets are starting points, not full email or URL standards validation. Testing runs with a time limit. Expressions target JavaScript Unicode regex syntax.