About This Tool
Documentation
What does this tool do?
A visual RegExp development laboratory. Test JavaScript regular expressions against multi-line sample text with live color-coded match group highlights, capture group tables, flag selectors (g, i, m, s, u, y), pre-built common regex pattern presets (Email, URL, IP, Phone, Dates), and live replacement preview.
When should you use it?
Use this tool to construct and verify complex regex patterns for input validation, extract structured data from log files, debug regex catastrophic backtracking, or test regex search-and-replace routines.
Key Capabilities & Features
Highlights
Interactive visual regular expression sandbox with real-time color-coded match highlighting
Structured capture group extraction table detailing group indexes, names, and matched values
Live regex find-and-replace simulator with real-time substitution preview ($1, $2, $<name>)
Curated regular expression pattern library (Email, URL, IPv4/IPv6, Phone numbers, Dates)
Flag toggle controls supporting global (g), case-insensitive (i), multiline (m), dotAll (s), and unicode (u)