Regex Tester

4 matches
  • Match 1Index: 0
    Hello
  • Match 2Index: 6
    World
  • Match 3Index: 23
    Regex
  • Match 4Index: 29
    Test

About Regex Tester

Regex Tester is an interactive regular expression debugger with real-time match highlighting, capture group breakdown, and regex flag toggles.

Key Capabilities & Features

✓

Real-time pattern match highlighting

✓

Capture group inspection and match index breakdown

✓

Toggle regex flags: Global (g), Case-insensitive (i), Multiline (m), DotAll (s), Unicode (u)

How to Use Regex Tester

  1. 01

    Enter regex pattern

    Type regular expression and select flags.

  2. 02

    Enter test string

    Paste text to match against the pattern.

  3. 03

    Inspect matches

    Review highlighted matches and capture groups.

100% In-Browser Privacy Guarantee

All operations in Regex Tester run locally in your web browser using HTML5, Web Cryptography, and WebAssembly APIs. Your text, files, credentials, and code never leave your computer.

Frequently Asked Questions

What JavaScript regex flags are supported?

Global (g), Case-Insensitive (i), Multiline (m), DotAll (s), and Unicode (u) flags are supported.

Related Developer Tools

Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa.

Use Tool
Color Picker

Pick colors, convert formats (HEX, RGB, HSL), and discover palettes.

Use Tool