Regex Tester
Use our free regex tester to test and debug regular expressions instantly. This regex tester helps you match patterns, find all matches, and validate regex - completely free with no registration required.
Browse more tools: Developer Tools • HTML Minifier • JS Minifier • JSON Formatter
About Regex Tester
Our free online regex tester helps you test and debug regular expressions instantly. Whether you're developing applications, processing text, or learning regex, this regex tester makes it easy. For other developer tools, check out our HTML minifier and JavaScript minifier.
The regex tester supports all standard regex features including groups, lookaheads, quantifiers, and character classes. It shows all matches, match positions, and provides real-time validation. Explore more developer tools for all your coding needs.
Perfect for developers, programmers, and anyone working with text processing. The regex tester is completely free, requires no registration, and provides instant results. If you work with JSON, try our JSON formatter.
Key Features:
- Test regex patterns - Test any regular expression pattern
- Find all matches - See all matches in your text
- Match positions - View start and end positions of each match
- Regex flags - Support for case insensitive, multiline, and more
- Pattern validation - Instant validation of regex patterns
- Real-time testing - Get results immediately
Test Regular Expression
Matches:
Text with Highlighted Matches:
Regex Error:
How to Use Regex Tester
- Enter your regular expression pattern in the pattern input field
- Enter the text you want to test against the regex pattern
- Select regex flags if needed (case insensitive, multiline, etc.)
- Click "Test Regex" to see all matches and their positions
- Review the highlighted text showing all matches
Learn more: According to Wikipedia's article on regular expressions , regular expressions are sequences of characters that define a search pattern, commonly used for pattern matching in strings.
Common Regex Patterns
Email:
[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
Phone Number:
\d{3}-\d{3}-\d{4}
URL:
https?://[^\s]+
Numbers:
\d+
Frequently Asked Questions
Is the regex tester free to use?
Yes, our regex tester is completely free to use. No registration or payment required.
What regex flags are supported?
The regex tester supports case insensitive (i), multiline (m), dotall (s), and verbose (x) flags.
Does it show match positions?
Yes, the tool shows the start and end positions of each match in the text.
Can I test complex regex patterns?
Yes, you can test any valid regular expression pattern, including complex patterns with groups, lookaheads, and more.