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Tools/dev/Regex Tester

Regex Tester

100% Air-GappedShortcut: R

Live RegExp evaluator supporting standard JavaScript regex flags (g, i, m, s, u), capture groups table, match indices, and cheat sheet.

Local processing
Presets:
//
Matches: 0
Input view
Split ratio:50% : 50%
Test Text Buffer
1
1 line·80 charsDrag & drop file to load
80 Bytes
Extracted Matches (0)
No regex matches found in test buffer.
Architectural Guide & Specs

Format, inspect, and explore with Regex Tester

Air-Gapped Local Computation

Interactive regular expression playground supporting real-time syntax matching, named capture groups, flag toggles, and high-performance JavaScript RegExp compilation.

Live Capture Group Inspection

Deconstruct matched patterns into indices and named capture groups with distinct color badges.

Production Preset Library

Quick-load battle-tested regex patterns for emails, IPv4/IPv6 addresses, UUIDs, ISO dates, and hexadecimal colors.

Flag Modifiers

Toggle global (g), case-insensitive (i), multiline (m), dotAll (s), and unicode (u) flags interactively.

Execution Environment:Client-Side V8 / WebAssembly
Network Ingress/Egress:Zero (100% Air-Gapped)
Local Persistence:IndexedDB / LocalStorage
PWA Offline Ready:Fully Supported
Developer Workflows

Common Production Use Cases

Web Dev01

Form Input Validation Prototyping

Craft robust regex constraints for web forms before deploying them to frontend or backend validation layers.

Client-Side Verified
SRE & Logs02

Log File Parsing & Telemetry Extraction

Extract timestamps, IP addresses, and HTTP status codes from structured server access logs.

Client-Side Verified
Gotchas & Mechanics

Frequently Asked Questions

It uses ECMAScript (JavaScript) RegExp engine built directly into your browser, matching modern standards including lookaheads and named groups.
Ecosystem Companions

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