JAVASCRIPT

check email regex js

/**
 * verifie si la chaine renseigné est un email
 * check if email is valide
 * @param string emailAdress
 * @return bool
 */
function isEmail(emailAdress){
    let regex = /^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/;

  if (emailAdress.match(regex)) 
    return true; 

   else 
    return false; 
}

//see https://regexr.com/3e48o for another exemple

Javascript validate email

function validateEmail($email) {
  var emailReg = /^([w-.]+@([w-]+.)+[w-]{2,4})?$/;
  return emailReg.test( $email );
}

if( !validateEmail(emailaddress)) { /* do stuff here */ }

how to validate email in node js

var emailRegex = /^[-!#$%&'*+/0-9=?A-Z^_a-z{|}~](.?[-!#$%&'*+/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-*.?[a-zA-Z0-9])*.[a-zA-Z](-?[a-zA-Z0-9])+$/;

function isEmailValid(email) {
    if (!email)
        return false;

    if(email.length>254)
        return false;

    var valid = emailRegex.test(email);
    if(!valid)
        return false;

    // Further checking of some things regex can't handle
    var parts = email.split("@");
    if(parts[0].length>64)
        return false;

    var domainParts = parts[1].split(".");
    if(domainParts.some(function(part) { return part.length>63; }))
        return false;

    return true;
}

checks for valid email address syntax javascript

var str = "Java Script Object Notation";
var matches = str.match(/(w)/g); // ['J','S','O','N']
var acronym = matches.join(''); // JSON

console.log(acronym)
 Run code snippet

checks for valid email address syntax javascript

let str = "Java Script Object Notation";
let acronym = str.split(/s/).reduce((response,word)=> response+=word.slice(0,1),'')

console.log(acronym);
 Run code snippet

checks for valid email address syntax javascript

var str = "Java Script Object Notation";
var matches = str.match(/(w)/g); // ['J','S','O','N']
var acronym = matches.join(''); // JSON

console.log(acronym)
 Run code snippet