Regex Tester
Test and debug regular expressions live
Regex Tester runs your regular expression against sample text and shows matches in real time. Developers use it to validate patterns before shipping them in code.
Enter a pattern and test string, then see captured groups and errors instantly. It is a sandbox for building reliable search and validation rules.
Frequently Asked Questions
What is Regex Tester?
Test and debug regular expressions live
Is Regex Tester free to use?
Regex Tester is 100% free on SmartConvertMax — no account, no signup, and no watermarks.
Is my data safe when I use Regex Tester?
Yes. SmartConvertMax is privacy-first: your files and text are processed securely and automatically deleted from our servers after a short period.
Do I need to install any software?
No. Regex Tester runs entirely in your browser — open the page and start right away.
More tools you might like
Word Counter
Count words characters and reading time
Remove Duplicates
Strip repeated lines from any list
Case Converter
Switch between UPPER lower and Title Case
Remove Extra Spaces
Clean up messy double spacing
Text Diff Checker
Spot the differences between two texts
PDF to Word
Convert PDF into editable Word docs
Latest guides
guide
Yards to Feet: Exact Formula, Conversion Chart & Real-World Uses
Convert yards to feet instantly. Learn the exact 3:1 formula, a quick conversion chart, and answers to common yard-to-foot questions for fabric and sports.
guide
Centimeter to Millimeter: Exact Formula, Chart & Ruler Guide
Convert cm to mm instantly. Learn the exact 10:1 ratio, ruler-reading tips, a quick conversion chart, and answers to common centimeter-to-millimeter questions.
guide
SmartConvertMax Conversion Hub: Every Tool and Guide in One Place
Your central hub for unit converters, PDF tools, image tools, and writing guides. Find every conversion calculator and how-to article in one place.
guide
Miles to Meters: Exact Formula, Conversion Chart & Running Guide
Convert miles to meters instantly. Get the exact formula, a full conversion chart, running race distances, and answers to common mile-to-meter questions.