Regex Tester — Test Regular Expressions
Test and debug regular expressions with real-time matching.
g: global | i: ignore case | m: multiline | s: dotall
💡 Regex Tips
\d= digit,\w= word char,\s= whitespace.= any char,*= 0+,+= 1+,?= 0-1[abc]= a or b or c,[^abc]= not a, b, or c
Why Choose Our Client-Side Regex Tester?
Process operations securely, quickly, and directly in your browser with 100% local client-side memory execution.
100% Secure & Local
Your data never leaves your device. All calculations, hashing and formatting are performed locally in sandboxed client memory.
High-Fidelity Code Formats
Preserves syntax, formatting blocks, text borders and configurations precisely during Regex Tester.
Blazing Fast Speeds
Powered by client-side browser workers, updates happen instantly without upload delays or network queue times.
Process in Three Simple Steps
Input Code
Paste, type, or drag & drop your raw code or inputs directly into the editor interface above.
Configure & Apply
Choose your conversion settings, custom formats, or keys and review the real-time preview results.
Save Output
Instantly copy the finalized code output to your clipboard or download it as a local file.
code_output
Ready for use
Frequently Asked Questions about Regex Tester
Yes, Regex Tester is 100% free with no sign-up, no watermarks, and no usage limits.
Yes. Files are uploaded over HTTPS, processed securely on our servers, and permanently deleted immediately after your download. We never store, view, or share your files.
You can upload files up to 5 MB. For larger files, consider compressing or splitting them first.
Yes, the tool handles files and pastes of any size. Very large inputs may take a moment to process.
Yes, Regex Tester is fully responsive and works in all modern browsers on desktop, tablet, and mobile.