17.4. Finding if a
Certain Substring Exists in a String: find() function
The
find() function helps
us find if a certain substring exists in a string. If yes, it returns
the index of the first character of the match in the string,
otherwise it returns -1. The function's syntax is:
String.find(string,
substring);
The
find() function returns
invalid if substring
is an empty string or if any error occurs.
Note
that the operation is case-sensitive.
The
following WMLScript examples demonstrate how to use the find()
function:
var
index = String.find("WMLScript Tutorial", "WML");
After
the execution of the above script, index contains the integral
value 0.
var
index = String.find("WMLScript Tutorial", "wml");
After
the execution of the above script, index
contains the integral value -1.
var
index = String.find("WMLScript Tutorial", "");
After
the execution of the above script, index
contains invalid.
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