insertBefore()

Core Math

insertBefore() is a MATLAB®-compatible core math function for insert newstr immediately before the first occurrence of pat in s. returns s unchanged if pat is not found. Run it online in your browser with SimLab — free, no install, no license required.

Insert newStr immediately before the first occurrence of pat in s. Returns s unchanged if pat is not found.

▶ Try insertBefore() in SimLab — Free

Syntax

insertBefore(s, pat, newStr)

Examples — run insertBefore() in your browser

insertBefore('helloworld', 'world', '---')

▶ Run

insertBefore("ab", "b", "X")

▶ Run

More Core Math Functions

Browse other free, MATLAB®-compatible core math functions in SimLab:

linspace()logspace()randn()rand()eye()zeros()

Browse all 510+ SimLab functions →

Frequently Asked Questions about insertBefore()

Is the insertBefore() 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 insertBefore() and 510+ other MATLAB®-compatible function references at simulations4all.com/simlab.

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

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

What does insertBefore() do?

Insert newStr immediately before the first occurrence of pat in s. Returns s unchanged if pat is not found. It is a MATLAB®-compatible core math function available in SimLab with the same calling syntax as MATLAB® — typically: insertBefore(s, pat, newStr).

Can I run insertBefore() in my browser?

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

Try SimLab — MATLAB®-compatible, free, in your browser

510+ functions. Runs in your browser. No install. No license.

Open SimLab

MATLAB® is a registered trademark of The MathWorks, Inc. SimLab is an independent project by Simulations4All and is not affiliated with, endorsed by, or sponsored by The MathWorks, Inc.