Regex Tester

Test and debug regular expressions with live match highlighting and capture groups.

Pattern

Flags

gims

Quick insert

EmailURLPhoneIPv4Date (YYYY-MM-DD)Hex Color

Test string

Matches highlighted

—

0 matches found

Enter a valid pattern to see match details.

What is a Regex Tester?

A regex tester lets you write regular expressions and immediately see how they match against test text. This tool uses JavaScript's native RegExp engine, so patterns behave exactly as they would in your code — no surprises when you copy them over.

How to use it

Type a regex pattern in the top field and toggle flags (global, case-insensitive, multiline, dotAll) as needed. Paste or type your test string below. Matches are highlighted instantly and listed with their positions and capture groups. Use the quick-insert chips to start from common patterns.

Common patterns

Email: [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}

URL: https?://[^\s]+
Phone: +?[\d\s-()]{7,}
IPv4: \d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}
Date (YYYY-MM-DD): \d{4}-\d{2}-\d{2}
Hex Color: #[0-9a-fA-F]{3,8}

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