Regex Practice Lesson 12 of 14

Global flag: find and replace all

str.replace(pattern, replacement) without the g flag stops after the first match - the rest of the string is left untouched, even if the pattern could match again later on. Add the g flag and .replace() changes behavior: it swaps out every match it finds, in one pass.

This is the same g flag from the price-extraction capstone (Phase 7), but paired with .replace() instead of .match() - there the goal was pulling matches out, here it's swapping matches out for something else, like redacting every phone number in a block of text with ***.

Your task: write redactFirstPhone(str), replacing only the first phone number found in str with "***", and redactAllPhones(str), replacing every phone number with "***". A phone number looks like 555-123-4567 - three digits, a dash, three digits, a dash, four digits.

You'll practice:

Seeing .replace() stop after the first match without the g flag
Adding g to replace every occurrence in one call

// Write redactFirstPhone(str): replace only the FIRST \d{3}-\d{3}-\d{4}
// match with "***".
function redactFirstPhone(str) {

}

// Write redactAllPhones(str): replace EVERY \d{3}-\d{3}-\d{4} match with "***".
function redactAllPhones(str) {

}