Regular Expression (Regex) Tester
Create, test, and debug your regular expressions with real-time results.
Testing Tool
No matches found.
Advanced Features
Substitution (Find & Replace)
Regex Cheat Sheet
- .
- Any character (except newline)
- \d
- Digit (0-9)
- \D
- Non-digit
- \w
- Word character (a-z, A-Z, 0-9, _)
- \W
- Non-word character
- \s
- Whitespace (space, tab, newline)
- \S
- Non-whitespace
This is a quick reference list. Behaviors may vary between Regex engines.
How to Use the Regex Tester
This interactive tool helps you build and test regular expressions in real-time.
- Write your Expression: Enter the pattern in the regex field. Do not include / delimiters.
- Provide the Text: Enter the base text for regex application.
- Adjust the Flags: Select desired options (Global, Ignore Case, Multiline).
- g (Global): Finds all occurrences.
- i (Ignore Case): Search without differentiating case.
- m (Multiline): Allows ^ and $ to match start/end of each line.
- Analyze results: Matches will appear highlighted in the results area.
- Test Substitutions: Use the Substitution section to test text replacement operations.
Frequently Asked Questions (FAQ)
What Regex engine does this tool use?
It uses the native JavaScript regex engine (V8), running directly in your browser.
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