'How to find and replace string in a file WITHOUT sed [duplicate]

This is for my setup repo which I use in fresh linux installs and company provided macbooks. I have this makefile target:

omz-theme:
    sed -i 's/ZSH_THEME=".*"/ZSH_THEME="$(THEME)"/g' $(HOME)/.zshrc

This works fine on linux but breaks on macs because they use BSD's sed. I need some way to find and replace text in my .zshrc that will run regardless of the system. Almost all resources online point only to sed.

Edit: This is how it "breaks" on mac. Doesn't happen if I do brew install gnu-sed and change the target to use gsed

sed: 1: "/Users/username/.zshrc": unterminated substitute pattern
shellspringspring-bootdockerkubernetesservice-discovery


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