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instr ( haystack_expr , needle_expr )
instr ( haystack_expr , needle_expr , start_expr )
instr ( haystack_expr , needle_expr , start_expr , boolean_expr)

returns positive_integer_value

Check to see if the string needle_expr is contained in the string haystack_expr. If it is, then this function will return the index of starting character of the first place where needle_expr occurs. Otherwise, this function will return 0. You may also specify an optional starting location for the search to begin start_expr and a boolean_expr to specify that the search will treat upper and lower case letters the same.

String indices begin at 1.

print instr("Hello", "lo")
print instr("101,222,333",",",5)

will display

4
8