RegEx Find & Replace Substitution Studio

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Perform regex find & replace with capture groups ($1, $2) and flag controls.

Instant Recipe Presets:

Regular Expression Pattern/gim

Replacement Template ($1, $2, $&)Tokens: $1, $2

Active Flags:Global (g)Case Insensitive (i)Multiline (m)DotAll (s)3 Matches Found

Input Source Text

Replaced Output Preview

Contact a***@company.com or b***@gmail.com for inquiries.
Support team: s***@techcorp.io

Extracted Capture Groups (3 Matches)

Match #1Index: 8

$&: "alice.smith@company.com"$1: "a"$2: "@company.com"

Match #2Index: 35

$&: "bob_99@gmail.com"$1: "b"$2: "@gmail.com"

Match #3Index: 81

$&: "support.help@techcorp.io"$1: "s"$2: "@techcorp.io"

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All computation executes exclusively inside your device memory using Web APIs and WebAssembly. No data or files ever leave your browser.

Real-Time Native Execution

Zero network roundtrips. Operates offline without sending external API requests, delivering instantaneous sub-millisecond computation.

Developer-First Architecture

Engineered with RFC standards, cryptographic primitives (Web Crypto Subtle API), and production-grade formatting libraries.

Step-by-Step: How to Use RegEx Find & Replace Substitution Studio

Enter Pattern: Write your search regular expression with optional capture groups.
Provide Template: Use $1, $2, or $& in your replacement template.
Review Output: Inspect live transformed text and copy the output.

Use $1 for the first captured group, $2 for the second, and $& for the entire matched substring.