Free JavaScript Regex Tester
Instantly test and debug your regular expressions online with this fast, interactive regex tool built for web developers.
Regular Expression
Test String
Results
What is a Regular Expression?
A regular expression (commonly known as a regex) is a concise and powerful way to define search patterns within text. It's widely used in programming languages like JavaScript for tasks such as string validation, pattern matching, and text manipulation.
Whether you're validating email addresses, parsing logs, or building dynamic search filters, regex gives you fine-grained control over how you match data.
Use this online regex tester to experiment, debug, and visualize your patterns in real time.
Example Regex Patterns:
Email adress detection
script.js
/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[\W_]).{8,}$/
This will find all valid emails
Strong passworld verification with regex
script.js
/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[\W_]).{8,}$/
Just find string with 8+ chars, 1 uppercase, 1 lowercase, 1 digit, 1 special char
Date (YYYY-MM-DD)
script.js
/\d{4}-\d{2}-\d{2}/
Find dates like: 2025-07-22
White spaces
script.js
/\s{2,}/g
Track every white space
Why Use This Regex Tool?
- Quickly test JavaScript regular expressions online
- See live matches and explanations
- Perfect for form validation, string parsing, and search functions