What do the g, i, m, and s flags do?

"g" finds all matches instead of just the first, "i" makes matching case-insensitive, "m" makes ^ and $ match the start/end of each line rather than the whole string, and "s" lets "." match newline characters too.

Does it show capture groups, not just the full match?

Yes -- each match's numbered (and named, if used) capture groups are shown alongside the full match, so you can verify exactly what a group extraction pattern will return.

developer Client-Side Only

Regex Tester & Matcher

Test regular expressions against sample text with live match highlights and capture groups.

Regular Expression Pattern

Flags (g, i, m, s)

Test Text String

Matches Found:2 match(es)

[email protected] (index: 8)[email protected] (index: 31)

Zero-Leakage Local Processing

All text formatting, JSON/JWT parsing, cryptographic hashing, and image compression execute entirely inside your browser. No private data is ever sent to Burnjet servers.

Quick Reference & Instructions

Simple steps, pro tips, and execution details

Paste or Enter Input

Paste your raw JSON, code snippet, tokens, or values into the input panel.

Select Options & Modes

Choose formatting options, indentation spaces, or target conversion standards.

Copy or Download Output

One-click copy to clipboard or download the formatted file ready for production.

How It Works

Evaluates JavaScript RegExp patterns with customizable flags (g, i, m, s) and highlights captured matches in real-time.

Frequently Asked Questions

Common questions about calculations, assumptions, and edge cases.

It uses JavaScript's native RegExp engine -- most syntax overlaps with PCRE and Python's `re` module, but some advanced features (like certain lookbehind variations) can differ slightly between engines.