REPLACE PART OF TEXT INSIDE A JSON FILE [closed]

I’m working in local with Javascript & Php, and I need to replace an object inside a json file, or at least get this object from my JS script.

My JSON file

I tried to use a regex but it doesn’t work.

function getParamsFromFile() {
fetch('./files/storage_game3_forSTACK.json', { cache: "no-store" })
.then(response => {
    response.text()
    .then( data => {  
        console.log(data);          

        const regExp = new RegExp("^/{.*?"6482515245115".*}/$")

        if (regExp.test(data)) {
            console.log('MATCHES : YES');
        }
        else {
            console.log('MATCHES : NO');
        }
    })
})        

}

Can you help me ?
Thx