Free Regex Tester Online
Test regular expressions with real-time match highlighting, flag support, and capture group display.
Key Features
Everything you need to test and debug regular expressions
Matches are highlighted in the test text instantly as you type, making it easy to see what your pattern captures.
Each match is listed with its position and any capture groups so you can inspect results precisely.
All processing runs locally in your browser. Your patterns and text never leave your device.
About the Regex Tester
Regular expressions are patterns used to match, search and manipulate text. This free regex tester lets you enter a pattern and test it against any text, showing all matches highlighted inline and listed with positions and groups. It uses the JavaScript RegExp engine and supports the g, i, m and s flags. Everything runs in your browser with no data sent to any server.
Frequently Asked Questions
Is this tool completely free?
Yes. The tool is 100% free to use with no registration, no subscription and no usage limits.
You can use it as many times as you need for personal or commercial projects without any cost.
We believe developer and productivity tools should be accessible to everyone without paywalls.
What do the regex flags do?
The g flag finds all matches in the text instead of stopping after the first. The i flag makes matching case-insensitive.
The m flag makes ^ and $ match the start and end of each line rather than the whole string.
The s flag (dotAll) makes the dot character match newlines as well as other characters.
How do I use capture groups?
Wrap part of your pattern in parentheses to create a capture group, for example (\d+) to capture a sequence of digits.
The match list will show each group value alongside the full match so you can see exactly what was captured.
Adlandırılmış gruplar (?
Bu araç hangi regex motorunu kullanıyor?
Araç, tarayıcınıza yerleşik olan JavaScript RegExp motorunu kullanır, bu nedenle sonuçlar bir JavaScript uygulamasında elde edeceğinizle tam olarak eşleşir.
Bu, ön uç JavaScript veya Node.js projelerinde kullanılmak üzere tasarlanmış desenleri test etmek için idealdir.
Python veya PHP gibi diğer diller için desenler sözdizimi ve davranış açısından biraz farklılık gösterebilir.