After going over the TextMatch page, I noticed there are regex matchers one can use like /first name/i, but I couldn't find out how to use these with a variable.

Example with fill function:

function fillInputElements(inputValuePair: { [id: string]: string }) {
 for (const [key, value] of Object.entries(inputValuePair)) {
 const inputEl = screen.getByRole('textbox', { name: key })
 inputEl.value = value
 }
}
fillInputElements({
 'First Name': 'John Simpleton2',
 'Last Name': 'Some LastName',
})

How to use the key with a case-insensitive match, or how can I make all role matches lowercase ?
I can't use exact: false as this would also introduce partial string matching which is something I don't want.