Regex Tester
Inspect text quality, limits, and structure with faster feedback.
Use JavaScript-style regex syntax. Matches show their position in the source text so you can debug patterns faster.
Source text or content to inspect
Tip: paste source text first, then add a regex pattern to test matches.
Processed result updates here
How to Use the Regex Tester
Follow these steps to use the regex tester quickly and get the right result.
Paste Your Text
Paste your test text into the input.
Type Your Text
Type your regular expression pattern.
Step 3
Matches are highlighted in the text instantly.
Step 4
See the list of all matches and capture groups below.
Learn when to use the Regex Tester and how to get better results.
Quick guidance, practical use cases, and answers to the most common questions users have about this tool.
About the Regex Tester
Test regular expressions against sample text in real time. Matches are highlighted as you type your pattern, with capture groups shown separately. Supports JavaScript regex syntax with flags (g, i, m, s).
How to Use the Regex Tester
- 1Paste your test text into the input.
- 2Type your regular expression pattern.
- 3Matches are highlighted in the text instantly.
- 4See the list of all matches and capture groups below.
Common Use Cases
- +Build and debug regex patterns for code
- +Validate regex before using it in production
- +Learn regular expression syntax interactively
- +Test email, URL, or phone number validation patterns
Why This Tool Helps
Use it to clean up repetitive text work faster, avoid formatting mistakes, and get a result you can copy straight into your next document, app, or workflow.
Frequently Asked Questions
What regex flavor does it use?
JavaScript (ECMAScript) regular expression syntax, which is compatible with most modern programming languages.
Can I test flags like case-insensitive or multiline?
Yes — toggle the i (case insensitive), g (global), and m (multiline) flags as needed.
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