RegexpTricks.js

// REGEXP TRICKS

//test string against array of strings
var string = "string";
var tests = ["test1", "test2", "test3"];
(new RegExp('\\b' + tests.join('\\b|\\b') + '\\b')).test(string)     // -> false
tests.push("string");
(new RegExp('\\b' + tests.join('\\b|\\b') + '\\b')).test(string)     // -> true

//test for valid email address
regex = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
regex.test(value);