Online regex validator

Test and validate regular expressions in real-time with detailed match results and syntax validation

Request Feature / Support

11,368+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

AI Web Tool Generator

Build Your Own Custom Web Calculator in Seconds

Type what tool or calculator you need below. Our AI will build it instantly for your site.

About This Tool

The Online Regex Validator is a powerful tool for developers, data analysts, and anyone working with regular expressions. Enter your regex pattern and test string to instantly see matches, capture groups, and validation results. The tool supports all common regex flags (global, case-insensitive, multiline, etc.) and provides detailed feedback including match positions, group captures, and error messages for invalid patterns. Perfect for debugging complex regex patterns or learning regular expression syntax.

Save your calculation history with a free account

How to Use

Enter your regular expression pattern in the 'Regex Pattern' field
Enter the text you want to test in the 'Test String' field
Select any regex flags you need (global, case-insensitive, multiline, etc.)
Click 'Validate Regex' to see all matches and validation results
Review the detailed results showing match positions, captured groups, and test statistics
Use the 'Clear All' button to reset the form and start fresh

Frequently Asked Questions

Find Quick Answers

What regex syntax does this tool support?

The tool supports JavaScript/ECMAScript regex syntax, which includes most common regex features: character classes, quantifiers, anchors, groups, lookaheads/lookbehinds, and all standard flags.

Can I test regex patterns with special characters?

Yes, the tool handles all special regex characters properly. You can test patterns with backslashes, brackets, parentheses, and other regex metacharacters. Invalid patterns will show clear error messages.

Does the tool save my regex patterns or test strings?

No, all processing happens locally in your browser. Your patterns and test strings are never sent to any server or stored anywhere.

What browsers are supported?

The tool works in all modern browsers including Chrome, Firefox, Safari, and Edge that support JavaScript ES6+ features.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

Related Tools

Other useful calculators and utilities you might like

Spotify to MP3 Converter

Convert Spotify tracks and playlists to MP3 format instantly with our free online converter.

Road Distance Calculator

Calculate the driving distance and travel time between two addresses with our free online road dista...

Age Calculator

Calculate your exact age in years, months, and days from any birth date to any target date.

Currency Converter

Convert currencies instantly with real-time exchange rates and historical data support.

Your Feedback Matters

Help Us to Improve