Capture substring within delimiters and excluding characters using regex

Question

How could a regex pattern look like to capture a substring between 2 delimiters, but excluding some characters (if any) after first delimiter and before last delimiter (if any)? The input string looks for instance like this:

var input = @"Not relevant {

#AddInfoStart Comment:String:=""This is a comment"";

AdditionalInfo:String:=""This is some additional info"" ;

# } also not relevant";

The capture should contain the substring between "{" and "}", but excluding any spaces, newlines and "#AddInfoStart" string after start delimiter "{" (just if any of them present), and also excluding any spaces, newlines and ";" and "#" characters before end delimiter "}" (also if any of them present).

The captured string should look like this

Comment:String:=""This is a comment"";

AdditionalInfo:String:=""This is some additional info""

It is possible that there are blanks before or after the ":" and ":=" internal delimiters, and also that the value after ":=" is not always marked as a string, for instance something like:

{  Val1 : Real := 1.7  }

For arrays is used the following syntax:

arr1 : ARRAY [1..5] OF INT := [2,5,44,555,11];
arr2 : ARRAY [1..3] OF REAL

Answer 1

This is my solution:

1. Remove the content outside the brackets
2. Use a regular expression to get the values inside the brackets

Code:

var input = @"Not relevant {

#AddInfoStart Comment:String:=""This is a comment"";

            Val1 : Real := 1.7

AdditionalInfo:String:=""This is some additional info"" ;

# } also not relevant";

// remove content outside brackets
input = Regex.Replace(input, @".*\{", string.Empty);
input = Regex.Replace(input, @"\}.*", string.Empty);

string property = @"(\w+)"; 
string separator = @"\s*:\s*"; // ":" with or without whitespace
string type = @"(\w+)"; 
string equals = @"\s*:=\s*"; // ":=" with or without whitespace
string text = @"""?(.*?)"""; // value between ""
string number = @"(\d+(\.\d+)?)"; // number like 123 or with a . separator such as 1.45
string value = $"({text}|{number})"; // value can be a string or number
string pattern = $"{property}{separator}{type}{equals}{value}";

var result = Regex.Matches(input, pattern)
                  .Cast<Match>()
                  .Select(match => new
                  {
                      FullMatch = match.Groups[0].Value, // full match is always the 1st group
                      Property = match.Groups[1].Value, 
                      Type = match.Groups[2].Value, 
                      Value = match.Groups[3].Value 
                  })
                  .ToList();