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Regex Tester

JS RegExp

Regex Tester is an interactive editor to evaluate regular expressions against sample text inputs in real-time. JavaScript regexp engine compiles input rules, matches strings matching specified flags, and prints matched segments in color highlights.

Open Regex Tester

How It Works

1

Enter Pattern

Type your regular expression string (e.g. ([A-Z]+) or \d{4}).

2

Choose Flags

Select standard RegExp modifiers like global matching (g) or case insensitivity (i).

3

Test matches

Type or paste test strings. Matches will instantly highlight in yellow with statistics.

Frequently Asked Questions

What RegExp modifiers are supported?

We support standard RegExp flags: global (g), case-insensitive (i), multiline (m), dotAll (s), unicode (u), and sticky (y).

Are my test scripts secure?

Yes, regex pattern compilations run locally in your tab memory, ensuring no proprietary text or code leaves your computer.