Regex for different combinations in Javascript

regex.js

//Regex for only Alphanumeric Characters with Space Included
var regex = new RegExp("^[a-zA-Z ]+$");

//Verifying Contact Number 
var contact = 1234567890;
var isnum = /^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/.test(contact);

//You can Refer this site for more Regex or You can Create your own Regex : http://regexr.com/