Regex Tester

Test JavaScript regular expressions with live match highlighting, group inspection, and replace preview.

Regular Expression

/ /

Global (g) Ignore case (i) Multiline (m) Dotall (s)

Test String

The quick brown fox jumps over the lazy dog. Email: hello@example.com. Phone: +1-555-123-4567.

Matches (highlighted)

Match Info

Replace

Replace Result

Common Patterns

Features

Real-time highlighting

Flag support (g, i, m, s)

Match group info

Common patterns reference

Replace function

1. Type your regex pattern in the top box.

2. Pick flags (g, i, m, s).

3. Type test text below — matches are highlighted live.

4. Switch to the Replace tab to preview replacements.

What is a regular expression?

A regular expression (regex) is a sequence of characters defining a search pattern for text matching.