Online Regex Tester | Test Regular Expressions Live

Use our powerful Regex Tester tool to write, test, and debug your regular expressions instantly. Whether you’re validating emails, extracting data, or matching patterns in a string, this tool makes it easier with real-time match highlighting and instant feedback. It’s an essential resource for developers working with complex pattern-based data manipulation.

How to Use the Regex Tester Tool

Follow these simple steps to test your regular expressions in real time:

Step 1: Enter Your Regex

In the “Regular Expression” field, type your regex in the format:

/pattern/flags

Example: /[a-z]+/gi

• The pattern goes between the slashes.
• Flags (like g, i, m) go after the last slash:
  • g = global match
  • i = case-insensitive
  • m = multiline mode

🔹 Step 2: Enter Test Text

Paste or type the text that you want to match your regex against in the “Test Text” box.

🔹 Step 3: Click “Test Regex”

Click the green “Test Regex” button to apply your pattern to the input text.

• If there’s a match, you’ll see: sqlCopyEdit✔ Match Found: yourmatch1, yourmatch2
• If no matches are found: pgsqlCopyEdit❌ No match found.
• If the regex is invalid, an error message will appear to help you fix the pattern.

🔐 Notes:

• The tool uses JavaScript-style regular expressions.
• Your regex and input text never leave your browser — it’s fully secure and private.
• Ideal for developers testing email validation, data extraction, pattern matching, and more.