How do I replace multiple strings in text file at the same time?

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I have a text file that looks something like this:
EGG SALAD ####
TREES
Line: A-A
Bacon
Line: B-B
More Broccolis
Line: C-C
and I would like to change the string A-A in my text file to C-C, and change the C-C to D-D.
In other words, what is the best way to change the string such that my results will look like this?
EGG SALAD ####
TREES
Line: C-C
Bacon
Line: B-B
More Broccolis
Line: D-D
I dont want this:
EGG SALAD ####
TREES
Line: D-D
Bacon
Line: B-B
More Broccolis
Line: D-D
I would also like the program to be able to read and save&replace the existing text file with same name/new name.

Accepted Answer

Walter Roberson
Walter Roberson on 17 Sep 2019
S = fileread('YourFileNameHere.txt');
newS = regexprep(S, {'C-C', 'A-A'}, {'D-D', 'C-C'});
This replaces C-C with D-D everywhere first, and only then does it look to replace A-A with C-C .
This only works if all of the replacement texts like D-D are things that are not going to be replaced later.
If you needed to exchange A-A and C-C then you would need a strategy such as
newS = regexprep(S, {'C-C', 'A-A', '!TEMP!'}, {'!TEMP!', 'C-C', 'A-A'});
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