Regex Tester

Test and validate regular expressions with real-time matching

Regular Expression Pattern

/ /

Test String

Match Results

0 matches

Quick Reference Guide

Character Classes

\d - Digit (0-9)
\w - Word character
\s - Whitespace
. - Any character

Quantifiers

* - 0 or more
+ - 1 or more
? - 0 or 1
{n} - Exactly n times

Anchors

^ - Start of string
$ - End of string
\b - Word boundary
\B - Not word boundary

Groups

() - Capture group
(?:) - Non-capture group
| - Alternation (OR)

Common Patterns

[A-Za-z] - Letter
[0-9] - Digit
[^abc] - Not a, b, or c

Examples

Email pattern
URL pattern
Phone (XXX-XXXX)

Real-time Testing

See matches highlighted instantly as you type your pattern

Pattern Validation

Automatic validation with helpful error messages

Quick Reference

Built-in guide with common patterns and examples

Complete Guide to Regular Expressions Testing

Regular expressions (regex) are powerful patterns used for matching, searching, and manipulating text. Our regex tester provides real-time pattern matching with syntax highlighting, making it easy to test and debug your regular expressions.

What are Regular Expressions?

Regular expressions are sequences of characters that define search patterns. They're used in programming languages, text editors, and command-line tools for pattern matching, validation, and text manipulation.

Common Use Cases

Regex is essential for email validation, phone number formatting, URL matching, data extraction, text search and replace, input validation, log file parsing, and web scraping.

Using This Tool

Enter your regex pattern, choose flags (global, case insensitive, multiline, etc.), and type or paste your test string. Matches are highlighted in real-time, showing you exactly what your pattern matches.