How to write a Regex that targets the first match in each line only?

I want to copy past a huge list of properties rather than type them all out again. However I want to avoid copy their assignments.

The solution I’m trying involves a cmdF regex in VSCode. Then selecting all found matches.
Sample of typescript code.

    this.anchorBillingAddress = this.page.getByTestId('billing-address-section');
    this.anchorShippingAddress = this.page.getByTestId('shipping-address-section');
    this.anchorBilling = this.page.getByTestId('billing-section');
    this.anchorGeneral = this.page.getByTestId('general-section');
    this.anchorStatistics = this.page.getByTestId('statistics-section');

this[^s]+
is what I have tried. However it ends up copying the assignment as well. How do I make it stop at the first white space encountered in each line?