What is the Regex Tester tool?

Test and debug regular expressions. This free online tool is available at NumbersChecker with no login required.

Is the Regex Tester tool free?

Yes, the Regex Tester tool is completely free to use at NumbersChecker. No account or installation is needed — results are instant.

How do I use the Regex Tester tool?

Enter your input into the form at https://numberschecker.com/tool/regex-tester, click Run, and the result appears instantly. Click any result value to copy it to your clipboard.

Is there an API for the Regex Tester tool?

Yes. Send a POST request to https://numberschecker.com/api/regex-tester with your input as a JSON body. The API is free and requires no authentication.

Text regularexpressionpatternmatch

Regex Tester

Test and debug regular expressions.

About the Regex Tester Tool

Test and debug regular expressions. This free online tool runs entirely in your browser — no login, no installation, and no data is stored.

This tool is part of the Text category on NumbersChecker. Browse all Text tools or explore all 139 tools.

Related: regular · expression · pattern · match

API usage

POST /api/regex-tester
Content-Type: application/json

{
  "text": "your input here"
}