Testing for a specific set of characters with in a string

[CES]

All,
Sorry for the 101 question but I was wondering if their was an easer way to test for a specific substring within a string .

I know I could split the string into an array ie:

var str = “this is a string”;

str.split(" is a ");

And then test if the array[1] that is produced is null but I was just wondering if their was a easier way of doing this. Thanks in advance - CES

 

[Baconbutty]

var indexPosition=sString.indexOf(" is a ");

or use Regular Expressions.

 

[Kevin Newman]

var str = "this is a string";

if (str.indexOf(" is a ") != -1) {
// do stuff
}

// or (4.0+ browsers)

if (/ is a /.test(str)) {
// do stuff
}