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