Regex Tester — Test Regular Expressions Online Free
💻 Code & DeveloperTest and debug regex patterns with real-time match highlighting. Supports all JavaScript flags. Free on WeLuvTools.
What is Regex Tester — Test Regular Expressions Online Free?
WeLuvTools Regex Tester is a free online tool for writing, testing, and debugging regular expressions with real-time match highlighting.
About Regex Tester — Test Regular Expressions Online Free
WeLuvTools Regex Tester is a free online tool for writing, testing, and debugging regular expressions with real-time match highlighting. Enter a regex pattern, set flags (g, i, m, s), paste test text, and see all matches highlighted instantly — along with capture group values. WeLuvTools supports the full JavaScript RegExp syntax. Perfect for developers validating input patterns, writing log parsers, or learning regex.
100% Private
Files stay on your device.
Super Fast
Results in just a few seconds.
Secure & Safe
No account or upload needed.
Practical Limits
Capacity depends on your device.
Practical scenarios
Use cases
Common ways people get more value from this tool.
Use case 1
Testing and debugging email validation regex patterns before using in production code
Use case 2
Writing regex for form input validation — phone numbers, postal codes, dates
Use case 3
Building regex patterns for log file parsing and data extraction pipelines
Use case 4
Testing find-and-replace regex patterns before applying in code editors
Use case 5
Learning regular expression syntax with instant visual feedback on WeLuvTools
Types & formats
Global (g)
Finds all matches in the string, not just the first one
Case-insensitive (i)
Matches uppercase and lowercase letters interchangeably
Multiline (m)
Makes ^ and $ match start/end of each line rather than the whole string
DotAll (s)
Makes . match newline characters in addition to all other characters
The WeLuvTools difference
Why choose WeLuvTools
Benefit 1
Real-time match highlighting as you type — instant visual feedback on every keystroke
Benefit 2
Shows all capture groups and their matched values
Benefit 3
Supports all standard JavaScript regex flags in one tool
Benefit 4
WeLuvTools Regex Tester runs entirely in your browser — private and instant
Benefit 5
Free to use without creating an account; practical capacity depends on your browser and device.