Function substring( str, startIndex, endIndex )

Description:
Returns a substring of a given string. The substring begins with the character at startIndex and continues to the character at index endIndex-1 Thus the length of the substring is endIndex-startIndex.
Parameters:
str (String)
the input string
startIndex (integer)
the beginning index, inclusive
endIndex (integer)
the end index, inclusive
Return Value (String):
substring of str
Example:
substring("Galaxy", 2, 5) = "lax"
Signature:
String substring(String, int, int)