how to check if string start with regex in nodejs code example

Example 1: javascript word start with

const str = "Saturday night plans";
const res = str.startsWith("Sat");
console.log(res); //> true

Example 2: javascript string starts with

//checks if a string starts with a word
function startsWith(str, word) {
    return str.lastIndexOf(word, 0) === 0;
}
startsWith("Welcome to earth.","Welcome"); //true

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