mid$ and mid$$ statement

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mid$ and mid$$		statement

Syntax:

mid$(stringVar$,startPos,numChars) = replaceString$

mid$$(container$$,startPos,numChars) = ¬

  replaceString$/contnr$$

Description:
This statement updates stringVar$ (which must be a string variable) or container$$ (a container variable), deleting a subpart from stringVar$ or container$$ and replacing it with an equal number of characters from the left side of replaceString$. The subpart to be replaced begins at position startPos within stringVar$ or container$$. In the following code fragments, containers and strings work the same. The number of characters replaced equals the smallest of these quantities:

numChars
len(replaceString$)
len(stringVar$) - startPos + 1

Under the following circumstances, mid$ does nothing:

When stringVar$ or replaceString$ is empty;
When startPos is less than 1 or greater than len(stringVar$);
When numChars is less than 1.

Note:
You may not use complex expressions that include containers on the right side of the equal sign.

Example:

x$ = "abcdefgh"

y$ = "abcdefgh"

z$ = "abcdefgh"

mid$(x$,2,3) = "1234"

print x$

mid$(y$,2,5) = "1234"

print y$

mid$(z$,7,4) = "1234"

print z$

program output:

a123efgh

a1234egh

abcdef12

See Also:
mid$ function; left$; right$; instr