How do I find and replace substrings through regular expressions in Matlab - regex

Question

I am using Matlabs regular expression function regexprep() to find and replace strings in a .c file
I have been trying to take the following strings in the .c file:
var[12] = powmacro(var[11],"name11",var[25],"name25");
var[13] = divmacro(var[23],"name23",var[12],"name12");
...and convert them to the following format:
var[12] = var[11]^var[25]
var[13] = var[23]/var[12]
Any ideas on how I can do this?

Answer 1

Here is an example code:
% regular expression patterns
re_sp = '\s*';
re_str = [re_sp '"[^"]*"' re_sp];
re_var = [re_sp '(var\[\d+\])' re_sp];
re_pow = [re_var '=' re_sp 'powmacro' re_sp '\(' ...
re_var ',' re_str ',' re_var ',' re_str ')' re_sp ';'];
re_div = [re_var '=' re_sp 'divmacro' re_sp '\(' ...
re_var ',' re_str ',' re_var ',' re_str ')' re_sp ';'];
% replace patterns in strings
str = {'var[12] = powmacro(var[11],"name11",var[25],"name25");' ;
'var[13] = divmacro(var[23],"name23",var[12],"name12");'};
str = regexprep(str, re_pow, '$1 = $2 ^ $3');
str = regexprep(str, re_div, '$1 = $2 / $3');
disp(str)
The result:
>> str
str =
'var[12] = var[11] ^ var[25]'
'var[13] = var[23] / var[12]'