Returns a substring of a string expression that begins at the specified offset location.
MID$(string_expression,start_offset[ ,length])
string_expression is any string expression.
start_offset is the position of the first character of the substring.
length is the number of characters in the substring. If you omit length, MID$ returns all characters from start_offset through the end of the string.
a$ = "ABCDEFGHI"
PRINT MID$(a$, 1, 5)
PRINT MID$(a$, 6)
Results in:
ABCDE
FGHI