Regex Tester — Test JavaScript Regular Expressions

Introduction

Try patterns with live match highlighting counts. Runs as a standard JavaScript RegExp in your browser.

Step-by-step

1. Enter a pattern and optional flags
2. Paste the text to search
3. Review matches and capture groups

Worked example

Pattern \d+ with flag g finds two matches: 42 and 99.

Use cases

• Debug email or phone validation patterns
• Extract groups from logs
• Learn regex flags (g, i, m, s, u)

Frequently asked questions