Regex Tester & Validator
Test, validate, and understand regular expressions with real-time feedback
Matches
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Match Details
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Regex Explanation
Enter a regular expression pattern to see an explanation.
Regex Cheatsheet
. - Any character except newline
\w - Word character [a-zA-Z0-9_]
\d - Digit [0-9]
\s - Whitespace character
\b - Word boundary
^ - Start of string/line
$ - End of string/line
* - 0 or more occurrences
+ - 1 or more occurrences
? - 0 or 1 occurrence
{n} - Exactly n occurrences
{n,} - n or more occurrences
{n,m} - Between n and m
[abc] - Any of a, b, or c
[^abc] - Not a, b, or c
a|b - a or b
() - Capture group
(?:) - Non-capturing group
How to use:
- Enter your regular expression pattern in the first input field
- Select the appropriate flags (global, case insensitive, etc.)
- Enter or paste the text you want to test against in the text area
- Click the "Test Regex" button to see the results
- View the highlighted matches, match details, and pattern explanation
- Use the cheatsheet for reference on common regex patterns
About Regular Expressions:
Regular expressions (regex) are powerful patterns used to match character combinations in strings. They are widely used for text validation, search and replace operations, and data extraction. Regular expressions can be simple, like matching a specific word, or complex, like validating an email address or parsing structured data.
This tool helps you test and understand your regex patterns with real-time feedback, highlighting matches, and providing explanations of what each part of your pattern does.