QuizOxa Tools
Back to Directory
Developer Client-Side

Free Online Regex Tester & Debugger

Write and test regular expressions with instant visual feedback. See matches highlighted in real-time as you type, inspect capture groups and their values, toggle flags (global, case-insensitive, multiline, dotAll), and view detailed match information including indices and named groups. Essential for building and debugging regex patterns for form validation, text parsing, log analysis, and data extraction.

100% In-Browser Privacy Instant Zero-Lag Execution Zero Data Uploaded
//g
Match 1index 14
john@example.com
Group 1: johnGroup 2: example.com
Match 2index 34
support@quizoxa.com
Group 1: supportGroup 2: quizoxa.com
Match 3index 78
admin@test.org
Group 1: adminGroup 2: test.org

Frequently Asked Questions

This tool uses JavaScript's native RegExp engine, which supports all modern features including named capture groups (?<name>), lookbehind assertions (?<=), Unicode property escapes (\p{}), and the dotAll (s) flag.

Similar Utilities

JSON Formatter

Developer

Beautify, format, and pretty-print minified JSON with proper indentation. Validate JSON syntax and catch errors instantly.

Open Tool Client-side

JSON Validator

Developer

Validate JSON syntax instantly with detailed error messages, line numbers, and suggestions to fix common JSON issues.

Open Tool Client-side

JSON Minifier

Developer

Minify and compress JSON by removing all whitespace and formatting. See size reduction statistics instantly.

Open Tool Client-side

XML Formatter

Developer

Format and beautify XML with proper indentation. Pretty-print compressed XML for readable debugging and analysis.

Open Tool Client-side

XML Validator

Developer

Validate XML syntax and check for well-formedness errors with detailed error messages and line-by-line analysis.

Open Tool Client-side

Base64

Developer

Encode text to Base64 or decode Base64 back to plain text instantly. Supports UTF-8 encoding and large payloads.

Open Tool Client-side