Developer Tools
Regex Tester
Test regular expressions with live highlighting and match details
Regular Expression Testing
Regex Pattern
Flags
Test Text
How to Use Regex Tester
1.
Enter Pattern
Type your regular expression pattern with proper syntax
2.
Add Test Text
Enter text you want to test the pattern against
3.
View Matches
See all matches highlighted with match details
Regex Tester Features
Full Regex Support
Supports all JavaScript regex features and flags
Real-time Testing
Test patterns instantly as you type
Save Test Cases
Save and reuse common regex patterns
Frequently Asked Questions
Q: What regex flags are supported?
A: We support global (g), case-insensitive (i), multiline (m), and dotall (s) flags. You can combine multiple flags.
Q: Why isn't my regex working?
A: Check for proper escaping of special characters. Remember that backslashes need to be escaped in JavaScript regex patterns.
Q: Can I test complex patterns?
A: Yes! This tester supports all JavaScript regex features including lookaheads, lookbehinds, capturing groups, and quantifiers.
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Regex Tester
Test regular expressions with live highlighting and match details
Regular Expression Testing
Regex Pattern
Flags
Test Text
How to Use Regex Tester
1.
Enter Pattern
Type your regular expression pattern with proper syntax
2.
Add Test Text
Enter text you want to test the pattern against
3.
View Matches
See all matches highlighted with match details
Regex Tester Features
Full Regex Support
Supports all JavaScript regex features and flags
Real-time Testing
Test patterns instantly as you type
Save Test Cases
Save and reuse common regex patterns
Frequently Asked Questions
Q: What regex flags are supported?
A: We support global (g), case-insensitive (i), multiline (m), and dotall (s) flags. You can combine multiple flags.
Q: Why isn't my regex working?
A: Check for proper escaping of special characters. Remember that backslashes need to be escaped in JavaScript regex patterns.
Q: Can I test complex patterns?
A: Yes! This tester supports all JavaScript regex features including lookaheads, lookbehinds, capturing groups, and quantifiers.
About Regex Tester
Test regular expressions against sample text with live match highlighting. See all matches, capture groups, and match positions instantly. Supports JavaScript regex syntax with all common flags (g, i, m, s).
Key Features
- Live match highlighting as you type the pattern
- Shows all match positions and captured groups
- Supports flags: global, case-insensitive, multiline
- Displays match count and match details panel
- Quick reference for common regex patterns
How to Use
- Enter your regular expression pattern in the pattern field
- Set any flags (g for all matches, i for case-insensitive)
- Paste or type the test string below
- Matches are highlighted in real-time; capture groups shown in the details panel
Frequently Asked Questions
What regex flavor does this tool use?
The tool uses JavaScript (ECMAScript) regular expression syntax, which is compatible with most modern languages including Python (with minor differences) and Ruby.
How do I make a regex case-insensitive?
Add the "i" flag to your pattern. In the tool, check the "Case Insensitive" checkbox, or write your pattern as /pattern/i.
What does the "global" flag do?
Without the global (g) flag, only the first match is returned. With the g flag, all matches in the test string are found and highlighted.
How do I test a regex for email validation?
A basic email regex is: /^[^@\s]+@[^@\s]+\.[^@\s]+$/. Paste it into the pattern field and enter test email addresses to verify it matches correctly.