Regex
Tester

Test regular expressions with real-time match highlighting, capture groups, and plain-English explanations.

PATTERN & FLAGS

Flags
Active:/pattern/g

TEST STRING

HIGHLIGHTED MATCHES

Enter a test string to see match highlights.

MATCHES

0 found

No matches found for the current pattern and flags.

REGEX EXPLANATION

Enter a regex pattern to see a plain-English explanation.

COMMON PATTERNS

Click a preset to load a ready-to-test pattern and flag combination.

Learn more

Why is regex so powerful yet so hard to read? Let’s look under the hood.

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Frequently Asked Questions

The tool uses JavaScript RegExp, including capture groups, named groups, character classes, lookaheads, quantifiers, and standard escapes.

Yes. You can toggle g, i, m, s, u, and y flags and see match results update in real time.

It uses native JavaScript regular expressions, so behavior matches what you get in modern browsers and Node.js.