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Simplify a string with MATLAB script

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Lucas S
Lucas S on 27 Feb 2020
Commented: Lucas S on 28 Feb 2020
Hello !
I have a string format which looks like this (this is not always 'A' before '_' and numbers) :
Eq = 'A_1+((A_2+A_3)&(A_4+A_5))+A_6';
How can i simplify the string like this (with a script) :
Eq = 'A_(1+((2+3)&(4+5))+6)'
For me the simplest way would be to delete all 'A_' iteration except the first one and to add a '(' after the first 'A_' but i don't know how to do it in a script.
Thank you in advance for your help !
Edit : After Stephen answer review, i realized i missed a detail : sometimes the string can be like this :
'A_number_1+((A_number_2+A_number_3)&(A_number_+A_number_5))+A_number_6';
==> 'A_number_(1+((2+3)&(4+5))+6)'
With multiple string for example : 'String_String_String_1' . Is there anyway to delete string and '_' behind a number ?

Accepted Answer

Stephen23
Stephen23 on 27 Feb 2020
Edited: Stephen23 on 27 Feb 2020
>> Eq = 'A_1+((A_2+A_3)&(A_4+A_5))+A_6';
>> Fq = regexprep(Eq, '^([A-Z]+_)(.*)', '$1\(${strrep($2,$1,'''')}\)')
Fq =
A_(1+((2+3)&(4+5))+6)
  10 Comments
Stephen23
Stephen23 on 28 Feb 2020
Edited: Stephen23 on 28 Feb 2020
"'Or use regexp but for me regexp is only for same format's same length's string (i'm probably wrong)"
I can't see anything in the regular expression that restricts it to "same length's string" as you write, it adapts exaclty to the the length of the leading name, with any number of 'string_' repetitions.
When I run it on all of your example strings, I get the expected outputs, e.g.:
>> Eq = 'A_number_1+((A_number_2+A_number_3)&(A_number_4+A_number_5))+A_number_6';
>> Fq = regexprep(Eq, '^(\w+?)(\d+\W.*)', '$1\(${strrep($2,$1,'''')}\)')
Fq =
A_number_(1+((2+3)&(4+5))+6)
and
>> Eq = 'string_string_number_1+((string_string_number_2+string_string_number_3)&(string_string_number_4+string_string_number_5))+string_string_number_6';
>> Fq = regexprep(Eq, '^(\w+?)(\d+\W.*)', '$1\(${strrep($2,$1,'''')}\)')
Fq =
string_string_number_(1+((2+3)&(4+5))+6)
etc. etc.
Please show me a single example of my code that does not give the expected output, so that I can check it.
Lucas S
Lucas S on 28 Feb 2020
Hmmm ok i'm dumb i tried with your 1st post thinking it was the new one ... My bad thank you !

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