String Methods Using Regex:

a) match()

Finds all matches in a string and returns an array.

JavaScript
let text = "The price is 100 dollars";
let regex = /\d+/; // Matches one or more digits.
let result = text.match(regex);
console.log(result); // Output: ["100"]

b) replace()

Replaces matched text in a string.

JavaScript
let text = "I love cats";
let regex = /cats/;
let replacedText = text.replace(regex, "dogs");
console.log(replacedText); // Output: "I love dogs"

c) test()

Tests if a pattern exists in a string. Returns true or false.

JavaScript
let regex = /hello/;
console.log(regex.test("hello world")); // true
console.log(regex.test("world"));       // false
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