Regex Tester

Test JavaScript regular expressions against sample text.

🌐 Uses API

Also try:Historical Age Calculator·Pet Age Calculator·Relationship Timeline

Matches

(none)

Frequently asked questions

Which engine is used?

Your browser's native JavaScript RegExp engine is used.

How do I capture multiple matches?

Use the global (g) flag to find multiple occurrences.

Does this support lookbehind?

Support depends on your browser version; modern browsers generally do.

Related tools

Privacy

Most processing happens locally in your browser for speed & privacy. Network calls occur only for live rates or updates.

Premium

Premium feature

Historical analysis & trends

Track your past calculations and visualize patterns.

Calculation presets

Save, load, and manage your favorite calculation setups.

Import

No presets saved yet.

Scenario planning

Compare multiple inputs side-by-side.

Batch processing

Upload a CSV to compute results in bulk.

Custom formulas

Create and reuse your own rules.

External data

Connect Google Sheets or an API as inputs.

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