Regular Expression – Character Classes Part 1

/*
  Regular Expression
  Character Classes
  . => matches any character, except newline or other line terminators.
  \w => matches word characters. [a-z, A-Z, 0-9 And Underscore]
  \W => matches Non word characters
  \d => matches digits from 0 to 9.
  \D => matches non-digit characters.
  \s => matches whitespace character.
  \S => matches non whitespace character.
*/

let email = 'O@@@g...com [email protected] [email protected] [email protected] O-g.com [email protected] [email protected]';
let dot = /./g;
let word = /\w/g;
let valid = /\w@\w.(com|net)/g;
console.log(email.match(dot));
console.log(email.match(word));
console.log(email.match(valid));