Meaning of javascript text between two slashes

Question

On Dreamweaver if I write on a Javascript document some text between two slashes like

Answer 1

You can use regular expression literals like this:

var pattern = /([0-9]+)/;
if(pattern.test(someString)) {
    // ...
} else {
    // ...
}

See also: https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Regular_Expressions