This support is available only if the underlying platform supports multithreading. You can create objects using object initializers. Changes to arrays . Array objects can be created using literal notation. Regular expressions .
Regular expressions are patterns used to match character combinations in strings.
You create a regular expression as an object that has methods used to execute a match against a string. You can also pass the regular expression as an argument to the String methods match , replace , search , and split . The RegExp object has properties most of which are set when a match is successful, such as lastMatch which specifies the last successful match. The Array object has new properties that provide information about a successful match such as input which specifies the original input string against which the match was executed. New top-level functions Number and String .