String.prototype.replaceAll()

const paragraph = "I think Ruth's dog is cuter than your dog!";

console.log(paragraph.replaceAll("dog", "monkey"));
// : "I think Ruth's monkey is cuter than your monkey!"

// Global flag required when calling replaceAll with regex
const regex = /Dog/gi;
console.log(paragraph.replaceAll(regex, "ferret"));
// : "I think Ruth's ferret is cuter than your ferret!"

replaceAll(pattern, replacement)

function unsafeRedactName(text, name) {
  return text.replace(new RegExp(name, "g"), "[REDACTED]");
}
function semiSafeRedactName(text, name) {
  return text.replaceAll(name, "[REDACTED]");
}
function superSafeRedactName(text, name) {
  // only match at word boundaries
  return text.replaceAll(
    new RegExp(`\\b${RegExp.escape(name)}\\b`, "g"),
    "[REDACTED]",
  );
}

let report =
  "A hacker called ha.*er used special characters in their name to breach the system.";

console.log(unsafeRedactName(report, "ha.*er")); // "A [REDACTED]s in their name to breach the system."
console.log(semiSafeRedactName(report, "ha.*er")); // "A hacker called [REDACTED] used special characters in their name to breach the system."

report = "A hacker called acke breached the system.";

console.log(semiSafeRedactName(report, "acke")); // "A h[REDACTED]r called [REDACTED] breached the system."
console.log(superSafeRedactName(report, "acke")); // "A hacker called [REDACTED] breached the system."

"xxx".replaceAll("", "_"); // "_x_x_x_"

"aabbcc".replaceAll("b", ".");
// 'aa..cc'

"aabbcc".replaceAll(/b/, ".");
// TypeError: replaceAll must be called with a global RegExp

"aabbcc".replaceAll(/b/g, ".");
("aa..cc");