Question

How to use RegExp object in JavaScript

Answer 1

// ==================================================
// Title: Reusable Validation Function
// ==================================================
//
// Store commonly used patterns in constants
// and reuse them through helper functions.
//

const emailPattern =
    /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

function isValidEmail(email) {
    return emailPattern.test(email);
}

console.log(
    isValidEmail("alice@example.com")
);

console.log(
    isValidEmail("not-an-email")
);


/*
run:

true
false

*/

 

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Answer 2

// ==================================================
// Title: Finding Capitalized Words
// ==================================================
//
// Find words that begin with a capital letter.
//

const text = "Albus visited Paris with Bob";

const pattern = /\b[A-Z][a-z]+\b/g;

const words = text.match(pattern);

console.log(words);


/*
run:

[ 'Albus', 'Paris', 'Bob' ]

*/

 

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