This routine replaces a all instances of a search string within one string with a replacement string.
All arguments are passed by reference and must be either movable strings or fixed strings.
The following program:
10 string$="Replace one thing with another thing." 20 find$="thing" 30 replace$="STRING" 40 A%=6:CALL&4083,string$,find$,replace$ 50 PRINT string$
Replace one STRING with another STRING.
If either string$ or find$ is an empty string, the original string is left untouched. If replace$ is an empty string, all instances of find$ are removed from string$.
BASIC wrapper function
You can wrap up the routine as a standard BASIC function using the following snippet:
You could then invoke it like this:
PRINT FN_REPLACE$("BBC BASIC is a good programming language.", "good ", "great")
which would output
BBC BASIC is a great programming language.