CODE EXAMPLE FOR JAVASCRIPT

regex for email validation

let regex = new RegExp("([!#-'*+/-9=?A-Z^-~-]+(.[!#-'*+/-9=?A-Z^-~-]+)*|"([]!#-[^-~ 	]|([	 -~]))+")@([!#-'*+/-9=?A-Z^-~-]+(.[!#-'*+/-9=?A-Z^-~-]+)*|[[	 -Z^-~]*])");