Using Regular Expressions with JavaScript and ECMAScript
If you use JavaScript to validate user input on a web page at the client side, using JavaScript's regular expression support will greatly reduce the amount of code you need to write.
Regular expressions is a form of pattern matching that you can apply on textual content. Take for example the DOS wildcards ? and * which you can use when you're searching for a file. That is a kind of very limited subset of RegExp.
