Regex Tester

Test regular expressions live - matches highlighted as you type.

Regular expression Common patterns Test string

Type a pattern and test string to see live matches.

Match details

BotixTech's free regex tester helps you build and debug regular expressions with instant feedback. Type a pattern, paste a test string, and every match lights up as you type.

Toggle flags like global, ignore-case and multiline, inspect capture groups per match, or start from a common preset like email or URL validation.

How to Test a Regex

Enter your pattern - without the surrounding slashes, just the expression.
Pick flags - g for all matches, i to ignore case, m for multiline, and more.
Paste a test string - matches highlight live in purple.
Inspect matches - each match shows its index and capture groups below.

Regex Tester Features

Live highlighting - matches update with every keystroke.
All common flags - g, i, m, s, u and y supported.
Capture groups - see each group's matched text per match.
Presets - email, URL, phone, date, IPv4 and hex color patterns.

Frequently Asked Questions

01.What is a regular expression?

A regular expression (regex) is a mini language for describing text patterns. Developers use it to validate emails, find phone numbers, extract data and rewrite text.

02.Which flags are supported?

All six JavaScript flags: g (find every match), i (ignore case), m (^ and $ match line starts and ends), s (dot matches newlines), u (unicode mode) and y (sticky matching).

03.Why does my pattern show an error?

The exact JavaScript error is shown above the results. The usual cause is an unescaped special character like an unclosed bracket or a stray backslash.

04.Is my test data uploaded anywhere?

No. The regex engine is your browser's own JavaScript engine, so your pattern and test text never leave your device.