===== 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 ====
<code>
print instr("Hello", "lo")
</code>
will display
<code>
4
</code>
