ShadowToolkit

RegEx Tester & Matcher

Test and debug regular expressions in real time.

100% In-Browser
100% In-Browser PrivacyLocal

Your files and data are processed locally and never leave your device.

Regular Expression (RegEx) Tester & Matcher

/
/
Matches Found (2)
support@shadow.net.inbilling@shadow.net.in

What is RegEx Tester & Matcher?

RegEx Tester & Matcher provides a real-time environment for constructing, testing, and debugging JavaScript Regular Expressions. It highlights match groups in real time, displays capture group breakdowns, and supports regex substitution with full flag controls (g, i, m, s, u).

Zero-Server Client-Side Guarantee

Unlike legacy online utilities that upload sensitive media and documents to remote cloud storage, Shadow Toolkit executes this entire operation directly within your browser's local runtime. Your raw data never crosses the network.

Key Capabilities

  • Real-time syntax highlighting for matching strings, capture groups, and named groups
  • Full flag toggles: Global (g), Case-Insensitive (i), Multiline (m), DotAll (s), Unicode (u)
  • Detailed capture group inspector showing exact start/end indices and group values
  • Regex substitution preview pane for testing string replacement rules
  • 100% private in-browser regex execution—your test data is never sent over the web

Common Use Cases

1Crafting and validating regex patterns for email, phone number, and password validation forms
2Testing log-parsing regular expressions before deploying them to production observability pipelines
3Experimenting with regex replace operations on text datasets
4Accelerating daily software development workflows, API debugging, and frontend data modeling

How to use RegEx Tester & Matcher

01

Enter RegEx Pattern & Flags

Type your regular expression pattern and toggle desired flags (g, i, m).

02

Input Test String

Paste sample text to test matches against.

03

Inspect Matches & Groups

Review highlighted matches and capture group breakdowns in real time.

04

Integrate with Project

Click 'Copy to Clipboard' or download the file to integrate the verified RegEx Tester & Matcher output directly into your application codebase or API client.

Frequently Asked Questions

It uses the native JavaScript RegExp engine (ECMAScript specification), matching the behavior of modern web browsers and Node.js.

Related Tools

Local

JSON Formatter & Validator

Format, validate, and minify JSON with real-time error detection.

Use Tool
Local

Json Validator

Json Validator running client-side on your device.

Use Tool
Local

JSON to CSV Converter

Convert JSON data into CSV spreadsheet tables.

Use Tool
Local

Word & Character Counter

Count words, characters, sentences, and estimated reading time live.

Use Tool