Regular Expression Tester Tool

Test and debug your regex patterns with real-time highlighting and detailed explanations

Pattern & Test String

Regular Expression:

Flags:

i (case-insensitive) g (global) m (multiline)

Test String: The quick brown fox jumps over 42 lazy dogs. Email: test@example.com, Phone: (123) 456-7890. Prices: $24.99, €19.99, ¥1500. Dates: 2023-12-31, 01/15/2023.

Example Patterns:

\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b Email addresses

(\d{1,2}[\/-]){2}\d{2,4} Dates (MM/DD/YYYY)

\$(\d+\.\d{2}) Dollar amounts

\b\w{5,}\b Words with 5+ letters

Match Results

Matches Found: 0

Enter a regex pattern and test string, then click "Test Regex"

Match Details:

Match details will appear here

Performance Stats

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Execution Time

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Pattern Length

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Test String Length

Pattern Information

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Pattern Explanation

A detailed explanation of your regex pattern will appear here

How to Use the Regex Tester

Enter Your Pattern

Type your regular expression in the "Regular Expression" field. Use standard regex syntax. For example, \d{3}-\d{3}-\d{4} matches phone numbers.

Set Flags

Select appropriate flags: "i" for case-insensitive matching, "g" for global search (find all matches), and "m" for multiline mode.

Provide Test Text

Enter the text you want to test against in the "Test String" field. You can paste any text content to see how your regex performs.

Run the Test

Click the "Test Regex" button to execute your pattern. All matches will be highlighted in the test string with detailed information.

Analyze Results

Review the highlighted matches, match details, and pattern explanation to understand how your regex works and debug any issues.

Try Examples

Use the pre-defined examples to quickly test common patterns like email validation, date matching, and currency extraction.

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