What is the best way to parse strings and nested brackets in C#?

Question

I am trying to write a program that takes a regular string with quotations and nested brackets and breaks them down in a list.

So far I am using this RegEX: @"[\""].+?[\""]|\{.*\}|(?=\()(?:(?=.*?\((?.?*.\1)(?*\)(..?*\2).*))(?=?*.\)(?..*?\2)(.*))?)+??*?(?=\1)[^(]*(?=\2$)|[^ ]+"

What i want it to do is this: if (eval (date day) == "14") {print "Today is the 14th"} else {print "It is not the 14th"}

if
(eval (date day) == "14")
{print "Today is the 14th"}
else
{print "It is not the 14th"}

but it returns as

if
(eval (date day) == "14")
{print "Today is the 14th"} else {print "It is not the 14th"}

I had this problem with the parenthesis and found a solution online but when I tried to change it to work with the {} it doesn't work.

I read online that RegEX doesn't work but I have not found a new solution. Is there any way I can do this?

Answer 1

If the delimiters are () and {} and you want to ignore string content that could contain
delimiters you just need to use a balanced text regex.

(?:[^(){}]+|(?:(?:(?'opP'\()(?>[^()"]+|"[^"]*")*)+(?:(?'clP-opP'\))(?>[^()"]+|"[^"]*")*?)+)+(?(opP)(?!))|(?:(?:(?'opBr'\{)(?>[^{}"]+|"[^"]*")*)+(?:(?'clBr-opBr'\})(?>[^{}"]+|"[^"]*")*?)+)+(?(opBr)(?!)))

C# sample

Regex RxParts = new Regex(@"(?:[^(){}]+|(?:(?:(?'opP'\()(?>[^()""]+|""[^""]*"")*)+(?:(?'clP-opP'\))(?>[^()""]+|""[^""]*"")*?)+)+(?(opP)(?!))|(?:(?:(?'opBr'\{)(?>[^{}""]+|""[^""]*"")*)+(?:(?'clBr-opBr'\})(?>[^{}""]+|""[^""]*"")*?)+)+(?(opBr)(?!)))" );
string test_sample = @"if (eval (date day) == ""14"") {print ""Today is the 14th""} else {print ""It is not the 14th""}";

Match M = RxParts.Match(test_sample);
while ( M.Success )
{
    string strM = M.Value.Trim();
    if ( strM.Length > 0 )
        Console.WriteLine("{0}", strM);
    M = M.NextMatch();
}

output

if
(eval (date day) == "14")
{print "Today is the 14th"}
else
{print "It is not the 14th"}