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Regex Tester

Test JavaScript regular expressions against sample text.

🌐 Uses API
Also try:Historical Age Calculator·Pet Age Calculator·Relationship Timeline
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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.

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Frequently asked questions

What is a regular expression (regex)?
Regex is a pattern language for matching text. It can find, validate, extract, or replace strings matching complex criteria. Examples: email validation, phone number extraction, log parsing. Regex is supported in virtually all programming languages.
How do I test my regex?
Enter your pattern in the regex field and test text below. Matches are highlighted in real-time. Capture groups are shown separately. Error messages appear if the pattern is invalid. Modify either and see results instantly.
What are common regex flags?
g (global): find all matches, not just first. i (ignore case): case-insensitive. m (multiline): ^ and $ match line boundaries. s (dotall): . matches newlines. Our tester lets you toggle flags and see their effects.
What are some commonly needed regex patterns?
Email: /^[\\\\w.-]+@[\\\\w.-]+\\\\.[a-zA-Z]{2,}$/. URL: /https?:\\\\/\\\\/[\\\\w.-]+\\\\.\\\\w{2,}[\\\\S]*/. Phone: /\\\\+?[\\\\d-()\\\\s]{10,}/. IP address: /\\\\d{1,3}(\\\\.\\\\d{1,3}){3}/. We have a cheatsheet with common patterns.
How do I extract captured groups?
Parentheses create capture groups. In pattern /(\\\\w+)@(\\\\w+)/ against \"user@domain\", group 1 = \"user\", group 2 = \"domain\". Named groups (?<name>...) make code more readable. Our tester shows all captured groups.

About This Tool

Test JavaScript regular expressions against sample text.

Key Benefits

How This Tool Works

  1. 1Enter your information in the input fields above
  2. 2Results calculate automatically in real-time
  3. 3Copy, share, or download your results as needed
  4. 4All processing happens locally in your browser for privacy

When to Use This Tool

Pro Tip:

Why Use INSINEX Tools?

Privacy First

Your data never leaves your device. All calculations happen locally in your browser.

Instant Results

No waiting, no loading—results appear immediately as you type.

Works Everywhere

Access from any device with a browser. Many tools even work offline.

Related topics: regex, regular expression, pattern tester, test regex, js regex

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Historical analysis & trends

Track your past calculations and visualize patterns.

Calculation presets

Save, load, and manage your favorite calculation setups.

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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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Free Tier Usage0/100 calculations today
Premium feature

Historical analysis & trends

Track your past calculations and visualize patterns.

Calculation presets

Save, load, and manage your favorite calculation setups.

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.

By paying you agree to our Terms & Conditions • Privacy Policy • Shipping Policy • Cancellation & Refunds