JavaScript by Example: Regular Expressions

Regular expressions (commonly referrex to as RegEx) in JavaScript help performing a few action against strings.

RegEx are used for:

• Searching text
• Replacing text
• Validating text

// Searching text
let text = "JavaScript by Example";
let n = text.search(/JavaScript/);

// Matching text
let text = "JavaScript by Example";
let result = text.replace(/JavaScript/i, "JS");

// Replacing text
let text = "JavaScript by Example";
let n = text.match(/JavaScript/);