JAVASCRIPT

indexOf()

let str = "Please locate where 'locate' occurs!";
str.indexOf("locate");

//it will returns the index of (the position of) the first occurrence of a specified text in a string:
// >> 7

//if you find this answer is useful ,
//upvote ⇑⇑ , so can the others benefit also . @mohammad alshraideh ( ͡~ ͜ʖ ͡°)

indexOf() usages

function find(needle, haystack) {
    var results = [];
    var idx = haystack.indexOf(needle);
    while (idx != -1) {
        results.push(idx);
        idx = haystack.indexOf(needle, idx + 1);
    }
    return results;
}
Code language: JavaScript (javascript)