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Regex Tester

Test JavaScript regular expressions, inspect matches, groups and replacements, and iterate with live sample text in the browser.

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RegexPatternReplace
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How to use

How to use Regex Tester

1 Enter the regex pattern and flags.
2 Paste the sample text.
3 Review highlighted matches, groups and replacement output.
Common uses

Regex Tester works well for these tasks

Validate patterns before coding

Check capture groups quickly

Preview replace rules on sample content

Recommended flow

Match, replace, then keep processing the text

Regex Tester → Text Cleaner → Word Counter → Text Diff Checker
FAQ

Frequently asked questions

What is Regex Tester useful for?

Validate patterns before coding

How do I start using Regex Tester?

Enter the regex pattern and flags. Paste the sample text. Review highlighted matches, groups and replacement output.

What should I do after this result?

Most people continue with Text Cleaner, Word Counter, Text Diff Checker next.