Regular Expression
Match Result
Common Regular Expressions
Generate Code
Description
Regex Tester provides a visual environment for writing and testing regular expressions, with real-time matching preview, common regex templates, and multi-language code generation to help developers quickly build and validate regex patterns.
Use Cases
Data validation: Test email, phone, ID card format rules
Text extraction: Extract specific patterns from logs or documents
Data cleaning: Use regex replacement to remove unwanted characters
Form validation: Write frontend input validation regex rules
Web scraping: Build regex for content extraction from web pages
Instructions
Enter regex pattern in the input box
Enter test string to match against
View real-time match results highlighted
Use common templates for quick start
Generate code in multiple programming languages
Notes
- Supports standard JavaScript regex syntax
- Matches are highlighted in real-time
- Flags like g, i, m can be toggled
- Complex patterns may need careful testing
FAQ
What regex syntax is supported?
Standard JavaScript regex syntax is supported, including character classes, quantifiers, and lookaheads.
How do I use regex flags?
Click the flag buttons (g, i, m, s) to toggle global, case-insensitive, multiline, and dotAll modes.