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We introduce two new methods:
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myString.IndexOf(lookfor);
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where myString and lookfor are any strings
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IndexOf returns the position of a character in myString that begins a substring exactly matching lookfor:
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var s = "http://www.npac.syr.edu";
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s.IndexOf("www"); // returns 7
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myString.IndexOf(lookfor, searchfrom);
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where searchfrom specifies the starting position of the search (see the previous foil for an example)
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myString.lastIndexOf(lookfor, lastsearchfrom);
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is similar to IndexOf but starts from the end of the string
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Default value of lastsearchfrom is myString.length - 1
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IndexOf and lastIndexOf return -1 if requested string is not found
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