Regex Tester & Validator

Test, validate and debug regular expressions with real-time matching and detailed explanations. This tool supports JavaScript regex syntax and provides instant feedback on pattern matches, groups, and flags.

How to use this Regex Tester

  1. Enter your regular expression pattern in the regex field
  2. Add test strings in the input field (one per line)
  3. Select regex flags (global, case-insensitive, multiline, etc.)
  4. View real-time matches, groups, and explanations
  5. Use the quick examples to learn common patterns

Common Regex Patterns

\d+ - One or more digits
[a-zA-Z]+ - One or more letters
\w+@\w+\.\w+ - Basic email pattern
^[A-Z][a-z]*$ - Capitalized words
\b\w{4}\b - Four-letter words
\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} - IP address pattern

Regular Expression

/ /

Test String

Results

Enter a regex pattern and test string to see results

Match Details

Match details will appear here when patterns are found