AT&T 6300 Programmer's Manual page 302

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Searches for the first occurrence of a given

substring in a string, and returns the position

at which the match is found.

INSTR([start,]string,substring)

is an integer expression in the range 1 to 255, which

specifies where the search is to begin.

omitted, 1 is

is a string expression (in particular a string constant or

variable) whose value is the string to be searched

is a string expression (in particular a string constant or

variable) whose first occurrence is to be reached for

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