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 AT()
 Return the position of a substring within a character string
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 Syntax

     AT(<cSearch>, <cTarget>) --> nPosition

 Arguments

     <cSearch> is the character substring for which to search.

     <cTarget> is the character string to search.

 Returns

     AT() returns the position of the first instance of <cSearch> within
     <cTarget> as an integer numeric value.  If <cSearch> is not found, AT()
     returns zero.

 Description

     AT() is a character function used to determine the position of the first
     occurrence of a character substring within another string.  If you only
     need to know whether a substring exists within another string, use the $
     operator.  To find the last instance of a substring within a string, use
     RAT().

 Examples

     .  These examples show typical use of AT():

        ? AT("a", "abcde")                  // Result: 1
        ? AT("bcd", "abcde")                // Result: 2
        ? AT("a", "bcde")                   // Result: 0

     .  This example splits a character string based on the position
        of a comma within the target string:

        cTarget := "Langtree, Lilly"
        ? SUBSTR(cTarget, 1, AT(",", cTarget) - 1)
        // Result: Langtree

        ? SUBSTR(cTarget, AT(",", cTarget) + 2)
        // Result: Lilly

 Files:  Library is CLIPPER.LIB.