Need Some help with regexp

Hello Everyone , I am trying to build a regular expression for the following code :

function myValue = getmyValue(object)

switch object 
    case 'fruit.Apple'
       x={'str1','str2','str3','str4','str5','str6','str7','str8','str9','str10'};
    case 'fruit.Banana'
       x={'PH1','PH2','PH3','PH4','PH5','PH6','PH7','PH8','PH9','PH10'};
    case 'fruit.mango'
       x={'Val1','Val2','Val3','Val4','Val5','Val6','Val7','Val8','Val9','Val10'};
    case 'bird.Eagle '
       x={'Obj1','Obj2','Obj3','Obj4','Obj5','Obj6','Obj7','Obj8','Obj9','Obj10'};
    case 'animal.lion'
       x={'Sp1','Sp2','Sp3','Sp4','Sp5','Sp6','Sp7','Sp8','Sp9','Sp10'};
end

This is my Code upon which a regular expression with following conditions needs to be applied :

1) After reading this code in a String format , I need to replace the value of x (which are some strings) by %searching its corresponding object..

2) For example//// I need to search for 'fruit.mango' from this code and replace the corresponding x value {Val1 ,Val2 ,....} with my own string (Lets Say, x={'ASDF','zxc','qwe','sdfdf','asas'};)

Can anyone point out how to do that// I am new to these regular expressions.. I can find out the Object(fruit.Apple) %But I am finding it difficult to replace the string in the next line.

Answer 1

[Walter Roberson]

filecontent = fileread('getmyValue.m');
newstrings = '''ASDF'',''zxc'',''qwe'',''sdfdf'',''asas''';   %no {}
newcontent = regexprep(filecontent, '(?<=''fruit\.mango''\s+x={)([^}]*)(?=})', newstrings);

Now newcontent is a string that can be further processed or fwrite() to a file.

[Aryan Sinha]

Hello walter ,

Thanks .. is there any way around by which I can automate this instead of giving manual inputs..

Example : Since it is a big switch case, i want to update all different values in a for loop

[Walter Roberson]

You can use string processing to build the pattern and the replacement.

For example,

target = 'fruit.mango';
x = {'ASDF','zxc','qwe','sdfdf','asas'};

escaped_target = regexprep(target, '\.', '\\.');
searchpat = sprintf('(?<=''%s''\\s+x={)([^}]*)(?=})', escaped_target);
newstrings = ['{''', strjoin( x, ''','''), '''};' ];
newcontent = regexprep(currentcontent, searchpat, newstrings);