So here is the way without using any regex by only using string and array methods.
const gUser = ['CAR.BENZ.CCLASS.1962', 'CAR.PORSCHE.911.2001', 'XYZAB.PORSCHE.YSA.2021']
for (let i = 0; i < gUser.length; i++) {
console.log('Required String: ', gUser[i].split('.').slice(1).join('.'));
}
What we do is, we split the string into parts where . is encountered.
gUser[0].split('.') returns ['CAR', 'BENZ', 'CCLASS', '1962']
Later when slice(1) is called, the zeroth element of array is chopped off and will return ['BENZ', 'CCLASS', '1962']
And finally using join('.'), we merge the array elements to a single string with a . between each element, which returns BENZ.CCLASS.1962
Hope this helps! :)
CARstring