Developer Tool

Regex Tester & Debugger

Test RegEx patterns in real-time, view match details, and preview replace results before using in your application.

Pattern & Flags

Pattern

/ /

Regex Cheat Sheet

Click token to insert

Test String

Matches

First Index

Status

Idle

Highlight Result

Run regex to see highlighted match results.

Replace Preview

Fill Replace Template then click "PreviewReplace".

Match Debugger

No match data yet.

How to Use

Quick guide to test, analyze, and reuse regex with more confidence.

Fill Pattern and Flags

Write pattern in the Pattern field, then enable flags as needed like g, i, or m.

Choose Mode and Run

Use Match mode to list all matches or Test for quick boolean results, then click Run Regex.

Check Results and Replace

Validate results in Highlight Result and Match Debugger, then fill Replace Template if you want to preview text transformation.

Quick Validation Tips

Start with small samples first, then add edge case variations like empty strings, special characters, and multiline input to ensure regex is truly safe for production use.