string text manipulation - adding data based on previous data in the string

Hi,

I have a string (char array) looking as follows:

Time,<Message_CMD>element1,<other_meesage>elemenX,<Message_CMD>element2,<Message_RPT>element3,

I'd like to change the string so that the element will contain the type of the message

Time,<Message_CMD>element1CMD,<other_meesage>elemenX,<Message_CMD>element2CMD,<Message_RPT>element1RPT,

What is the simplest way to do it?

EDIT: note that element1 is both CMD and RPT

Answer 1

[Stephen23]

T = 'Time,<Message_CMD>element1,<other_meesage>elemenX,<Message_CMD>element2,<Message_RPT>element3'

T = 'Time,<Message_CMD>element1,<other_meesage>elemenX,<Message_CMD>element2,<Message_RPT>element3'

U = regexprep(T,'([A-Z]+)>([^,]+)','$1>$2$1')

U = 'Time,<Message_CMD>element1CMD,<other_meesage>elemenX,<Message_CMD>element2CMD,<Message_RPT>element3RPT'

[michael]

This one may work for me.

Can you please elaborate the parameters?

[Walter Roberson]

If I read correctly element3 needs to become element1RPT with the change in digit

[Stephen23]

"Can you please elaborate the parameters?"

Here is a breakdown of the match (regular) and replacement expressions:

regexprep(T,'([A-Z]+)>([^,]+)','$1>$2$1')
%            (      )                      group 1
%             [A-Z]+                       match one or more capital letters
%                    >                     match literal ">" character
%                     (     )              group 2
%                      [^,]+               match one or more non-commas
%                               $1         group 1
%                                 >        literal ">"
%                                  $2      group 2
%                                    $1    group 1 (this adds the text you want)

So the regular expression matches one or more capital letters followed by ">" followed by one or more non-commas (any character that is not a comma). For example:

'Time,<Message_CMD>element1,<other_meesage>elemenX,<Message_CMD>element2,<Message_RPT>element3'
%              ^^^             group 1
%                 ^            literal ">"
%                  ^^^^^^^^    group 2

It then replaces all of that matched text with exactly the same text, plus it appends group 1 on the end.

Now that I think about it, I could have saved one character by placing ">" inside group 2.

Answer 2

[Walter Roberson]

regexprep(S, {'element[12]', 'element3'}, {'$1CMD', '$1RPT'})

[michael]

Please have a look on the update of the question

[Walter Roberson]

 regexprep(S, {'element[12]', 'element3'}, {'$1CMD', 'element1RPT'})

Answer 3

[David Hill]

m=replace(m,'element1','element1CMD');
m=replace(m,'element2','element2CMD');
m=replace(m,'element3','element3RPT');

[michael]

Please have a look on the update of the question