Security & Tokens
100% Client-Side Privacy
Instant High-Performance Output
Regex Tester
Test and debug Regular Expressions in real-time with instant match highlighting.
Quick Summary:
Test regular expressions in real-time. Test patterns against sample text with live group matches and flag controls.
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Input & Controls
0 characters
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What is Regex Tester?
Interactive regex testing tool with flags (g, i, m, s, u), capture group inspection, match count, and live highlight markers.
Unlike traditional online utilities that upload your sensitive payloads to a remote server, TechnoLila's Regex Tester executes 100% locally in your web browser using modern JavaScript APIs, HTML5 Canvas, and SVG vector rendering. No barcodes, asset IDs, Wi-Fi credentials, tokens, or proprietary payloads ever leave your device.
How to Use Regex Tester Online
Enter regular expression pattern, choose flags (e.g. g, i), and enter test string.
Regex Tester Example
Example Input:
Pattern: [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}\nText: Contact info@technolila.com or support@example.orgExample Output:
Match 1: info@technolila.com
Match 2: support@example.orgCommon Use Cases
Email validation, URL pattern testing, log parsing, data sanitization.
Common Mistakes & Gotchas
Unescaped forward slashes or missing global flag (g).
Frequently Asked Questions
Which regex engine is used?
Standard JavaScript ECMAScript RegExp engine with full Unicode and lookahead support.
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