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How to find a substring in another string in JavaScript?

Can anyone tell me how to find a substring within another string in JavaScript? 

Example: 

My string is: "The language we use today is JavaScript".  
How do I determine whether this string contains "today"?

Thank you.
Chris
Christopher Ronny, Oct 23, 2013
Reply 1
This should do it.

<script>
        var testString = "The language we use today is JavaScript";

        function doesStringExist(input, token) {
            return input.indexOf(token) > 0;
        }

        alert(doesStringExist(testString, "today"));

    </script>

 
King Wilder, Sep 21, 2014


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