The MID$ statement substitutes one or more new characters for existing characters of a previously defined STRING.
Syntax
MID$(baseString$, startPosition%[, bytes%]) = replacementString$
Description
- The baseString$ variable must exist and be large enough to contain the replacementString$.
- startPosition% specifies the string character position to start the overwrite.
- bytes% or number of characters is optional. Excess byte lenghts are ignored.
- The replacementString$ should be as long as the byte length reserved.
- The length of the original string is not changed in any case. If replacementString$ is longer, it gets clipped.
Example(s)
Using INSTR to locate the string positions and a MID$ (statement) statement to change the words.
text$ = "The cats and dogs were playing, even though dogs don't like cats."
PRINT text$
start% = 1 ' start cannot be 0 when used in the INSTR function!
DO
position% = INSTR(start%, text$, "dog")
IF position% THEN ' when position is a value greater than 0
MID$(text$, position%, 3) = "rat" ' change "dog" to "rat" when found
start% = position% + 1 ' advance one position to search rest of string
END IF
LOOP UNTIL position% = 0 ' no other matches found
PRINT text$
The cats and dogs were playing, even though dogs don't like cats.
The cats and rats were playing, even though rats don't like cats.