string replace with regex if matches javascript code example

Example 1: string replace javascript

let re = /apples/gi; 
let str = "Apples are round, and apples are juicy.";
let newstr = str.replace(re, "oranges"); 
console.log(newstr)

output:

"oranges are round, and oranges are juicy."

Example 2: js regex replace multiple matches

str.replace(/-|:|\./g,''); // replace all matches of "-", ":" and "." in str