Regex Tester
Test and debug regular expressions with live match highlighting and flag controls.
Regular Expression Tester
//gi
About this tool
The Regex Tester lets you write and test regular expressions with live match highlighting.
Toggle flags like global, case-insensitive, multiline, and dot-all to fine-tune your pattern behavior.
All processing happens entirely in your browser — no data is ever sent to our servers.
How to use
- 1Enter your regex pattern in the pattern field.
- 2Toggle flags as needed (g, i, m, s).
- 3Type or paste your test string below.
- 4Matches are highlighted live as you type.
Frequently Asked Questions
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