Regular Expression (Regex) Tester
Text & String Tools100% Client-SideTest and debug regular expressions in real-time with visual match highlighting and capture groups.
//gi
Templates:
Test String114 chars
Matches Found:2
SponsorNon-intrusive
What is Regular Expression (Regex) Tester?
A powerful real-time Regular Expression testing tool. Test regex patterns with instant match highlighting, detailed capture group inspection, support for common flags (g, i, m, s, u), and a cheat sheet of popular patterns.
Key Features
Real-time syntax evaluation as you type
Visual match highlighting with index positions
Detailed breakdown of capture groups
Toggle regex flags: Global (g), Case Insensitive (i), Multiline (m), DotAll (s), Unicode (u)
Pre-built common templates (Email, Phone, URL, IPv4, Slug, Date)
Common Use Cases
- Validating form inputs (email, phone numbers, postal codes)
- Extracting specific substrings from server log files
- Building search and replace rules for text processing
Frequently Asked Questions
This tool uses the standard ECMAScript (JavaScript) RegExp engine built into your browser.
SponsorNon-intrusive
Related Tools
Text & Code Diff Checker
Compare two text files or code snippets side-by-side with line-by-line and character diff highlighting.
Markdown Live Editor & Preview
Live markdown editor with synchronized split-screen preview, GitHub Flavored Markdown (GFM) support, and HTML export.
String Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, and Title Case.