extractBefore()

Core Math

extractBefore() is a MATLAB®-compatible core math function for return the substring of s that comes before the first occurrence of pat. returns the full string if pat is not found. Run it online in your browser with SimLab — free, no install, no license required.

Return the substring of s that comes before the first occurrence of pat. Returns the full string if pat is not found.

▶ Try extractBefore() in SimLab — Free

Syntax

extractBefore(s, pat)

Examples — run extractBefore() in your browser

extractBefore('hello.txt', '.')

▶ Run

extractBefore("file.m", ".")

▶ Run

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Frequently Asked Questions about extractBefore()

Is the extractBefore() function free to use in SimLab?

The browser workspace requires no MATLAB® license or installation. Connected features require network access and may have account, tier, availability, or usage limits. You can open extractBefore() and 510+ other MATLAB®-compatible function references at simulations4all.com/simlab.

Do I need to install MATLAB to use extractBefore()?

No. SimLab’s core parser, workspace state, and most functions run locally in your browser. The extractBefore() function requires no MATLAB® license or desktop software download.

What does extractBefore() do?

Return the substring of s that comes before the first occurrence of pat. Returns the full string if pat is not found. It is a MATLAB®-compatible core math function available in SimLab with the same calling syntax as MATLAB® — typically: extractBefore(s, pat).

Can I run extractBefore() in my browser?

Yes. Open SimLab at simulations4all.com/simlab, write or paste code that calls extractBefore(), and run it. This function’s calculation runs locally in the browser. SimLab session analytics, sharing, feedback, and eligible acceleration have separate network boundaries.

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