Instr 
 Format 
instr( string1, string2 )
 Description 
Check to see if string2 is contained in string1.  If it is, then this function will return the index of starting character of the first place where string2 occurs.  Otherwise, this function will return 0.
 Note 
String indices begin at 1.
 Example 
print instr("Hello", "lo")
will display
4