Regex Tester

What Regex Tester does

How to use the Sadevz Regex Tester

1. 1

   Enter a regular expression pattern in the pattern field and toggle flags like g, i, m, s, or u as needed

2. 2

   Paste the test text you want to match against in the test string area to see matches highlight live as you type

3. 3

   Review the match details listed below to see full match information and capturing group data

4. 4

   Use the replace testing section to input a replacement string and preview exactly what your pattern would produce

Regex Tester FAQ

Can I use this tool offline once the page loads?

Yes, the tool runs entirely client-side using JavaScript's built-in RegExp engine, so your pattern and test text never leave your browser and the tool works offline after the initial page load.

What regex flags are supported in the Sadevz tester?

The tool supports JavaScript flags g (global), i (ignore case), m (multiline), s (dotAll), and u (unicode) that can be toggled on or off alongside your pattern.

How do I test replacement strings with my regex pattern?

Use the replace testing section to input a replacement string using $1, $2, or $<name> references for capturing groups, and the tool will preview exactly what your pattern would produce.

Is my data private when using the Regex Tester?

Yes, all matching runs locally in your browser using JavaScript's RegExp engine; your pattern and test text never leave your device or hit any server.