Content is loading…
Test regex patterns with live match highlighting.
Test and debug regular expressions in real time. Enter a regex pattern and test string to see all matches highlighted, capture groups, and match details instantly.
Regex Tester provides a fast, client-side environment for writing, testing, and debugging regular expressions with live match highlighting and capture group inspection. Because it runs directly in the browser with no installation or immediate sign-up required, it offers a lightweight way to validate patterns without disrupting local development environments.
Good to know: Very large text inputs or complex patterns requiring automated test suites or offline execution may be better suited for native IDE extensions or local scripting environments.
Quickly test and debug regular expressions with real-time match highlighting and capture group details.
Open the Regex Tester tool
Navigate to the Regex Tester page to access the live pattern testing interface.
Enter your regular expression pattern
Type or paste your regex pattern into the designated input field to begin the matching process.
Input your test string
Provide the sample text or data you want to test against your regular expression pattern.
Review highlighted matches in real time
Observe the instant highlighting in your test string to verify which parts of the text match your pattern.
Analyze capture groups and match details
Check the detailed results section to inspect specific capture groups and match positions for debugging.
Estimated time: PT1M
Share this tool
Beautify, minify, and validate JSON data instantly.
Encode and decode Base64 strings instantly.
Generate v4 UUIDs instantly, single or in bulk.
Explain any code in plain language — all languages supported.
Convert Unix epoch timestamps to/from readable dates.
Decode JWT tokens and inspect header, payload, and expiry.
Convert text or Markdown to a Word .docx file with live preview, RTL, and page-setup options.
Draw a Secret Santa with exclusions and share a private reveal link for each person.
Make custom bingo cards from your own words — play, print, or share a link.
Convert images to video with the Ken Burns zoom/pan effect. Add music and export as WebM.
Load and compare multiple URLs side by side in resizable iframes.
Rank anything with quick 1-v-1 matchups → a full ordered list you can share.
Convert Markdown to a fully customized, RTL-ready PDF.
See your public IP address plus full location, ISP, ASN, timezone, coordinates, and more.
