INSTR searches a specified String for an occurrence of a given Sub-String and assigns its position (1-based) to Name. The search is case sensitive. Start is the position in String to start the search for Sub-String. If Start is not given, it is assumed to be 1 (the start of the string). If Sub-String is not found, the position assigned to Name is 0.
Syntax
Name INSTR [Start,]String,Sub-StringRemarks
INSTR assigns the position value to a name as if it were a numeric equate.
pos INSTR <person>, <son>