StudioLimb
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Regex Tester

Validate, debug, and understand your Regular Expressions in real-time. Client-side processing for your data privacy.

Developer Utility
/ /
Common Flags:
g - Global match
m - Multiline
i - Ignore case

Test String

0 matches

Match Results

Waiting for valid regex...

How to Use the Free Regex Tester

Regular Expressions (Regex) are incredibly powerful patterns used to match character combinations in strings. Our free client-side Regex Tester allows you to build, validate, and debug complex regular expressions instantly without ever sending your sensitive text data to an external server.

Simply enter your pattern between the forward slashes / /, modify the matching flags (like g for global or i for case-insensitive), and paste your target text below. The tool will highlight matches in real-time.

Frequently Asked Questions (FAQ)

Which Regex syntax is supported?

StudioLimb's Regex Tester runs directly in your browser using the JavaScript (ECMAScript) Regex engine. This means it fully supports JS-specific features like lookahead, lookbehind (in modern browsers), and named capture groups.

Is my test data private?

100% Private. If you are testing regex patterns against confidential user data, passwords, or emails, it is crucial that this data is not intercepted. Because our tool is pure Client-Side logic, nothing is ever uploaded to a backend. It functions offline.

What do the flags mean?

Flags change how the regex engine searches. g (global) finds all matches rather than stopping after the first. i (ignoreCase) makes [A-Z] match [a-z]. m (multiline) makes ^ and $ match the start/end of a line, not just the whole string.