JSON Formatter
Prettify, minify, and validate JSON.
.*
Regex Tester
Test regular expressions with live matches.
//g
toco.tools launched on 2024-04-01 and updated on 2025-11-20.
2 matches
- #1 2024-04-01 @23
- $1: 2024
- $2: 04
- $3: 01
- #2 2025-11-20 @49
- $1: 2025
- $2: 11
- $3: 20
About Regex Tester
A regex tester shows which parts of sample text match your pattern—ideal for validation rules, log parsing, and replace previews.
toco.tools updates matches live in the browser as you edit pattern and flags.
Behavior follows JavaScript regex semantics, which may differ from PCRE or other engines. Complex patterns can be slow on huge inputs.
How to use
- Enter your regex pattern
- Type sample text
- Review highlighted matches
FAQ
What is a regex tester?
An interactive tool that shows where a pattern matches sample text.
Can I test on Japanese text?
Yes. Unicode strings including Japanese work like any other text.
Is uploaded data sent externally?
No. All processing runs in your browser.