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Test regular expressions in real-time with live highlighting, match groups, and built-in pattern library. 100% private and browser-based.
Enter a pattern to see token explanations.
Progress from simple matching to advanced extraction with level-based guided practice.
Understand regex building blocks and test patterns safely.
Step 1
Match a fixed word with simple literal patterns.
Step 2
Use character classes and quantifiers for flexible matching.
Step 3
Toggle flags and observe differences in results.
Step 4
Read capture groups from the match details panel.
Practice goal: Create a robust email or phone validator pattern and test edge cases.
Real-time pattern matching with instant highlighting and match visualization.
Pre-built patterns for email, phone, URLs, IP addresses, credit cards, and more.
Test regex replacements with full support for capture groups and backreferences.
View all captured groups from your regex with detailed indexing.
Understand exactly what each part of your regex does with step-by-step breakdowns.
Built-in reference guide covering all common regex syntax and modifiers.
Test email, phone, and password patterns before implementing them in your applications.
Extract specific information from text using capture groups and test patterns against real data.
Build and test replacement patterns to transform text with complex find-and-replace operations.
Validate input patterns to prevent security issues and ensure data conforms to expected formats.
Build regex patterns to parse URLs, extract tracking parameters, and analyze web data.
Create patterns to search and extract information from logs and system output.
Type your regex pattern in the input field. The tester supports all JavaScript regex syntax.
Paste the text you want to test against. Multi-line support for batch testing.
See live highlighting of all matches and captured groups with detailed information.
Use Replace Mode to test pattern substitutions with capture group backreferences.
All regex testing happens locally in your browser. No data is stored or sent to servers.
Get real-time results with live highlighting as you type your regex patterns.
Built-in tutorials, explanations, and cheat sheet to help you master regex.
Yes, Shrinkify's regex tester is completely free. There are no hidden fees, registrations, or usage limits. Everything runs locally in your browser.
No. All pattern matching and testing happens entirely in your browser. We don't store, log, or transmit any of your regex patterns or test text.
This tool uses JavaScript's built-in RegExp engine, which supports ECMAScript regex syntax including lookaheads, lookbehinds, named capture groups, and Unicode properties.
Yes. This tool fully supports multiline testing. Simply toggle the multiline flag and paste multi-line text to test patterns against multiple lines.
The Pattern Library contains common regex patterns for email validation, phone numbers, URLs, IP addresses, credit cards, and more. Click any pattern to load it instantly.
Capture groups (parentheses) extract specific portions of matched text. This tool displays all captured groups separately, making it easy to debug complex patterns.
Use dedicated links for each regex task and advanced workspace mode.
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Use workflow playbooks for regex compatibility, extraction safety, and production hardening.
Master regular expressions with our free, private, and fast regex tester. No registration required.
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