Regex Tester
Test regular expressions with live matching and highlighting.
Common Patterns:
Pattern
//g
Test String
Matches 0
How to use
- Enter a regex pattern or select a common pattern
- Set flags (global, case insensitive, etc.)
- Enter test string to match against
- View highlighted matches and match details
Matches are highlighted in yellow in real-time
What is Regex?
Regular expressions (regex) are powerful patterns used to match character combinations in strings. They're essential for text processing, validation, search and replace operations.
Basic Syntax
. any char | \d digit | \w word | \s spaceQuantifiers
* 0+ | + 1+ | ? 0-1 | {n} exact | {n,m} rangeCommon Use Cases
Validation
Email, phone, URL formats
Search
Find patterns in text
Replace
Find and replace text
Extract
Pull data from strings
Sanitize
Clean user input
Parse
Parse logs, data files