Is Regex Tester free to use?

Yes, Regex Tester on DevHexLab is completely free. No login, no account, and no payment required.

Does Regex Tester upload my data to a server?

No. Regex Tester runs entirely in your browser using client-side JavaScript. Your data never leaves your device and is never sent to any server.

Yes. Once the page is loaded, Regex Tester works without an internet connection because all processing happens locally in your browser.

Regex Tester belongs to the "Text & Code" category on DevHexLab. Diff, format, convert, and clean text and code

Test regular expressions with live matching and highlighting

regexregexptestpatternmatch

Common Patterns

Pattern

Flags

Test String

Match Preview0 matches

Enter test string above...

Learn more

Step-by-step guide

How to Test a Regular Expression

Step-by-step guide to writing, testing, and debugging regular expressions using the DevHexLab Regex Tester.

In-depth article

Regular Expressions Every Developer Should Know

From email validation to URL parsing, these regex patterns cover the most common developer needs with practical explanations.

Regex Generator

Generate common regex patterns for emails, URLs, phones, and more

Text Diff Checker

Compare two pieces of text and highlight the differences

Code Formatter

Format and beautify HTML, CSS, and JavaScript code